Can you help me with this question?

Answer:

2

Step-by-step explanation:

3(2x + 4)=?

6x + 12

6x/6=x

12/6=2

x=2

Answer:

1/15

Step-by-step explanation:

You have a 1/3 chance of being an elf.

You have a 1/5 change of having the magic tool.

1/3 × 1/5 = 1×1/3×5 = 1/15

Answer:

it is 1/15

Step-by-step explanation:

Answer:

a:  1003 < µ < 1023

b:  See attached photo for answers

c:  see below

d and e:  See second attached photo

f:  See below

Step-by-step explanation:

a.  to find a confidence interval, first find the error with the formula,

E = Z(σ/√n)  where Z is the value of the z-score that relates to the confidence level, σ is the standard deviation of the population (or of the sample if the population standard deviation isn't given), and n is the sample size

For this problem, E = 1.96(108/√453) = 9.95 = 10

Now add and subtract that value form the sample average...

x - E < µ < x + E      becomes    1013 - 10 < µ 1013 + 10

simplifies to 1003 < µ < 1023

b.  See attached photo for hypothesis test results...

c.  H0:  µ = 1013  

    Ha:  µ > 1013 (claim)

They want to test if it's greater than their first attempt,  so this claim becomes the alternate hypothesis.  We're testing against their first attempt, that's why µ = 1013, not 1000

d and e.  See second attached photo for hypothesis test results...

f.  There is enough evidence to support the claim that the students second attempt was an improvement from their first attempt.  They happened to take a 2 hour tutoring course between tests.  This doesn't prove that the tutoring was effective thought.  It very well might have been effective, but also, the students taking the test again means they've already seen the test and know what to expect, which could have also boosted their scores.  

This would be D cause these are 30,60, 90 angles. 30 (X) 60(X square root of 3 and 90 2x).

Answer:

C

Step-by-step explanation:

Using the sine ratio on the right triangle on the right side

sin30° = [tex]\frac{opposite}{hypotenuse}[/tex] = [tex]\frac{y}{8}[/tex]

Multiply both sides by 8 × sin30° = y

⇒ y = 8 × [tex]\frac{1}{2}[/tex] = 4 → C

Final answer:

The best first step to simplify the equation -2(x+3)=-10 is to distribute the -2 to the terms inside the parentheses and simplify. Then, solve for x by isolating the variable.

Explanation:

The best first step to simplify the equation -2(x+3)=-10 is to distribute the -2 to the terms inside the parentheses. This can be done by multiplying -2 with each term inside the parentheses.

So, -2(x+3) becomes -2x-6. The equation now becomes -2x - 6 = -10.

Now, we can proceed with solving the equation by isolating the variable x.

We can begin by adding 6 to both sides of the equation to get -2x = -4.

Finally, we divide both sides of the equation by -2 to solve for x.

So, x = 2.

The correct answer is option c. [tex]\frac{-2}{\ 2}(x+3) = \frac{-10}{\ 2}[/tex]

When solving the equation -2(x+3)=-10, the best first step is to divide both sides by 2. This simplifies the equation by making it easier to solve.

Here are the steps:

By dividing first, you simplify the algebraic manipulation and make solving the equation straightforward.

The complete question is:
When solving equation which is the best first step to begin to simplify the equation -2(x+3)=-10

a. [tex](-2)(-2)(x+3) = -10(-2)[/tex]

b. [tex]\frac{-1}{\ 2}(-2)(x+3) = (-10)\frac{-1}{\ 2}[/tex]

c. [tex]\frac{-2}{\ 2}(x+3) = \frac{-10}{\ 2}[/tex]

d. [tex]\frac{-2}{-10}(x+3) = \frac{-10}{-10}[/tex]

Answer:

Option C. [tex]65[/tex]

Step-by-step explanation:

we know that

The discriminant of a quadratic equation of the form [tex]ax^{2} +bx+c=0[/tex] is equal to

[tex]D=b^{2}-4ac[/tex]

in this problem we have

[tex]2x^{2} +3x-7[/tex]  

so

[tex]a=2\\b=3\\c=-7[/tex]

substitute

[tex]D=3^{2}-4(2)*(-7)[/tex]

[tex]D=9+56[/tex]

[tex]D=65[/tex]

The discriminant of the giving polynomial is 65. The correct option is C. 65

From the question, we are to determine the discriminant of the given polynomial

The given polynomial is

2x²+3x-7

This is a quadratic function

The discriminant of a quadratic function is simply the value in the square root of the quadratic formula

That is,

Discriminant, D = b² - 4ac

In the given quadratic function, 2x²+3x-7

a = 2, b = 3 and c = -7

∴ D = 3² -4(2)(-7)

D = 9 +56

D = 65

Hence, the discriminant of the giving polynomial is 65. The correct option is C. 65

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Answer:

10 quarts

Step-by-step explanation:

There are 4 quarts to a gallon, and she bought 2 1/2 gallons, or 2.5 gallons, so she bought 4(2.5) = 10 quarts

Answer:

$42

Step-by-step explanation:

Divide $18 by 3 to get a unit rate of $6 per hour. Then, multiply by 7 hours to get $42.

Answer:

[tex]\large\boxed{Q4.\ C.\ \text{Infinitely Many Solutions}}\\\boxed{Q5.\ D.\ \text{No Solution}}[/tex]

Step-by-step explanation:

[tex]Q4.\\\\\left\{\begin{array}{ccc}-4y+4=x&(1)\\2x+8y=8&(2)\end{array}\right\\\\\text{Substitute (1) to (2):}\\\\2(-4y+4)+8y=8\qquad\text{divide both sides by 2}\\-4y+4+4y=4\qquad\text{combine like terms}\\4=4\qquad\bold{TRUE}\\\\\text{Infinitely Many Solutions}[/tex]

[tex]Q5.\\\\\left\{\begin{array}{ccc}6x+2=y&(1)\\3y-18x=12&(2)\end{array}\right\\\\\text{Substitute (1) to (2):}\\\\3(6x+2)-18x=12\qquad\text{divide both sides by 3}\\6x+2-6x=4\qquad\text{combine like terms}\\2=4\qquad\bold{FALSE}\\\\\text{No Solution}[/tex]

The statistical technique applicable here is simple random sampling and binomial distribution. The formula for a binomial distribution is used to estimate the probabilities of a specific number of satisfactions among the randomly selected 15 adults. The average number and variability can also be calculated for this binomial distribution.

This question is about statistics, particularly a technique called simple random sampling. In the given scenario, it's reported that 66% of adults are satisfied with the major airlines' job. We're asked to conjecture about a scenario where 15 adults are chosen at random and the number who are satisfied is observed.

First, this scenario is modeled with a binomial distribution. A binomial distribution is appropriate here because you're considering a certain number of 'trials' (15 adults), and for each trial, there are two possible outcomes - the adult is either satisfied or not satisfied with the airlines. The 'success' probability (satisfaction) remains constant (66%).

A. If we want to know the probability of exactly x adults satisfied, the formula for a binomial distribution is used: P(X = k) = C(n, k) * (p^k) * ((1 - p)^(n - k)), where C(n, k) is combinations of n things taken k at a time, n is number of trials (15), p is the probability of success (66% or 0.66), and k is the number of successes we want exact probability for.

B. If we want to know the expected value or the average number of adults satisfied, it's simply n*p, in this case 15*0.66 = 9.9, meaning, on average, about 10 adults out of 15 should be satisfied according to the poll report.

C. If we want to compute the variability, we can calculate the standard deviation. For a binomial distribution, the standard deviation, sigma, is square root of [ n*p*q ], where q = 1-p is the probability of 'failure', or an adult not satisfied.

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Answer: option d.

Step-by-step explanation:

You have the following formul given in the problem:

[tex]p=1-e^{-mt}[/tex]

You know that:

The number of  customers serviced in an hour by the technical support representative is 6 costumbers, therefore:

[tex]m=6[/tex]

As the problem asked for the probability that  a costumber will be on hold less than 30 minutes, we know that:

[tex]t=0.5[/tex]

Substitute the values above into the formula.

Then, you obtain:

[tex]p=1-e^{-(6)(0.5)}=0.95[/tex] or 95%

Answer:

70

Step-by-step explanation:

50+20 = 70

ANSWER

70

EXPLANATION

We want to increase 50 by 40%

Method 1

New amount =50+40% of 50

[tex] = 50 + \frac{40}{100} \times 50[/tex]

[tex] = 50 + \frac{40}{2} [/tex]

[tex] = 50 + 20[/tex]

[tex] = 70[/tex]

Method 2.

50 corresponds to 100%.

New amount corresponds to (100+40=140)%

This implies that, New amount

[tex] = 140\% \times 50[/tex]

[tex] = \frac{140}{100} \times 50[/tex]

[tex] = \frac{140}{2} [/tex]

[tex] = 70[/tex]

Answer:

26

Step-by-step explanation:

Let his age = x

Equation

x - 12 = 14            

Solution

Add 12 to both sides.

x - 12 +12 = 14 + 12

x = 26

He is currently 26 years old.

48 students in group 2

43 students in group 1

So in total there are 91 students

7 students play the trump

And 20 play the trombone

Therefore it is known that 27 students play those two instruments in total

Because of this, Subtract 27 from 91 to get the num of students who doesn't play those instruments.

Answer:

7.75 F

Step-by-step explanation:

you will do 7/2 *

convert 2.25 to imporper fraction

multiply the denomintor

Answer:

7.75

Step-by-step explanation:

Answer:

−115.940465

Step-by-step explanation:

Simplified = −115.940465

Answer:

-4/3.

Step-by-step explanation:

Using the change of base formula  convert to  log 3:

logb x = loga x / loga b

log(1/27) 81 = log3 81 / log3 1/27

log3 81  = 4 ( because 3^4 = 81) and log3 1/27 = -3 (because 3^-3 = 1/27)

So  log(1/27) 81 = 4/-3 = -4/3.

Answer:

[tex]\large\boxed{Q\#1.\ A)\ \dfrac{8}{3}x+6}\\\boxed{Q\#2.\ A)\ \dfrac{1}{3}(p+45)}[/tex]

Step-by-step explanation:

[tex]Q\#1:\\\\\dfrac{2}{3}(4x+9)\qquad\text{use the distributive property}\\\\=\left(\dfrac{2}{3}\right)(4x)+\left(\dfrac{2}{3}\right)(9)=\dfrac{8}{3}x+(2)(3)=\dfrac{8}{3}x+6\\\\Q\#2:\\\\\dfrac{1}{3}p+15=\dfrac{1}{3}p+\dfrac{1}{3}\cdot(3)(15)=\dfrac{1}{3}p+\dfrac{1}{3}\cdot45=\dfrac{1}{3}(p+45)[/tex]

ANSWER

Explicit formula:

[tex]a_n= 8n - 23[/tex]

Recursive

[tex]a_{n}= a_{n - 1} + 8,a_1=-15[/tex]

EXPLANATION

The first term of the sequence is

[tex]a_1=-15[/tex]

The common difference is

[tex]d = - 7 - - 15[/tex]

[tex]d = 8[/tex]

The nth term is given by the formula,

[tex]a_n=a_1 + d(n - 1)[/tex]

[tex]a_n= - 15+ 8(n - 1)[/tex]

[tex]a_n= - 15+ 8n -8[/tex]

The explicit formula is;

[tex]a_n= 8n - 23[/tex]

The recursive definition is

[tex]a_{n}= a_{n - 1} + 8,a_1=-15[/tex]

Answer:

  [tex]r=\dfrac{I}{Pt}[/tex]

Step-by-step explanation:

Solve this the way you do any "solve for" problem. Locate the variable of interest and identify what has been done to it. Undo that.

Here, the variable of interest is "r". It has been multiplied by Pt. We undo that multiplication by dividing by that product:

  [tex]I=Prt\\\\\dfrac{I}{Pt}=\dfrac{Prt}{Pt}\\\\\dfrac{I}{Pt}=r \quad\text{simplify}[/tex]

Answer: The temperature would be -2 degrees at midnight.

Step-by-step explanation:

If you take 8 and minus 10 then you get -2!

Answer:

-2

Step-by-step explanation:

hope it will help youu!!!

Answer:

  yes, and no

Step-by-step explanation:

There are a few trig functions that are "simple" and can be memorized. Usually, these are the ones for angles of 0°, 30°, 45°, 60°, 90°. See below for a table.

To solve an equation like this for DE, you multiply both sides of the equation by 4 (cancelling the denominator).

  4·tan(90°) = DE

The tangent of 90° is "infinity." So, the length of DE will be infinite for an angle of 90°.

_____

Trig functions of multiple angles and half angles can be derived from those in the table using the appropriate formulas. The math can get messy fast.

Of course, SOH CAH TOA reminds you of the relationships between trig function values and right triangle side measures. You may not know the angle measure (and it may be irrelevant), but you can find the trig function value.

Answer:

See below.

Step-by-step explanation:

You can find them by constructing a right angled triangle with the given angle and measuring the sides  giving sin = opposite / hypotenuse , cos = adjacent / hypotenuse and tan = opposite / adjacent ( SOH-CAH-TOA).

For  tan 90 degrees you think of an 'imaginary' triangle where opposite side = hypotenuse and the adjacent side = 0 ( in fact a vertical line!) .Now tan  x = opposite / adjacent  =  opposite / 0 which is indeterminate. There is no value for the tan of 90 degrees and so there is no solution to your problem.

Answer:

999

 530

+469

----------

 999

Answer:

[tex]m<1=26.4\°[/tex]

[tex]m<2=153.6\°[/tex]

Step-by-step explanation:

we know that

If m<1 and m<2 form a linear pair

then

[tex]m<1+m<2=180\°[/tex] -----> by supplementary angles

substitute the values and solve for x

[tex](2x+20)+48x=180\°[/tex]

[tex]50x=180\°-20\°[/tex]

[tex]50x=160\°[/tex]

[tex]x=3.2\°[/tex]

Find the measure of each angle

[tex]m<1=(2x+20)=2(3.2\°)+20\°=26.4\°[/tex]

[tex]m<2=48x=48(3.2\°)=153.6\°[/tex]

Length:width

6 inches: 1 inch

30 inches: 5 inches

Since the ratio for length is multiplied by 5, you would do the same for width.

Answer:

  3.9

Step-by-step explanation:

A calculator is useful for this.

Answer:

Centimeter

Step-by-step explanation:

Erasers are pretty small so I would say it was about 5 cm.

Answer:

The second option.

3x + 6 = 21.

Step-by-step explanation:

3x + 6 = 21.

If x = 5, plug it in.

3 · 5 + 6 = 21

15 + 6 = 21

Hope this helps,

Davinia.

Answer:

Second Option

Step-by-step explanation: