Mental math refers to numbers that are easy to compute mentally. These calculations can be done in your head without the need for a calculator or written work.
Explanation:Mental math refers to numbers that are easy to compute mentally. These are calculations that can be done in your head without the need for a calculator or written work. For example, mental math can involve adding or subtracting small numbers, multiplying or dividing by powers of 10, or using estimation to approximate a value. It is a useful skill to develop as it saves time and allows for quick calculations.
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Estimation and mental math techniques, like knowing certain reciprocals, help to easily compute numbers mentally, a skill valuable in both academic and real-world settings.
Explanation:Estimation and mental math are key concepts when considering numbers that are easy to compute mentally. By using heuristics, such as knowing the reciprocals of numbers that multiply to 10, or by rounding numbers to nearest tens or hundreds, we can simplify computations and make them more manageable without the use of calculators or paper. This approach is particularly useful when dealing with real-world scenarios where exact numbers are not necessary and approximate values will suffice.
What is the slope intercept form of the linear equation x + 4y = 12
Which ratio forms a proportion with 18/27?
A. 1/3
B. 2/5
C. 2/3
D. 7/9
Answer:
C. [tex]\frac{2}{3}[/tex]
Step-by-step explanation:
The proportions are nothing but the equivalent ratios.
We are given the proportion = [tex]\frac{18}{27}[/tex]
We can reduce this proportion using the Greatest Common Factor (GCF).
The GCF of 18 and 27 is 9.
Therefore, dividing the numerator and the denominator by 9, we get
= [tex]\frac{18divide9}{27divide9}[/tex]
= [tex]\frac{2}{3}[/tex]
Therefore, the answer is C. [tex]\frac{2}{3}[/tex]
Andrea ordered a computer on the internet the computer cost $1399 plus 6 1/2% sales tax what was the total amount Andrea paid for her computer?
Answer:
$1489.94
Step-by-step explanation:
6 1/2 in decimal form would be 0.065
Multiply total by decimal.
1399 x 0.065
= 90.935
Add sum to total.
90.935 + 1399
= 1489.935
In money it would be rounded to
$1498.94
Help evaluating the question for 14,16
If 2 feet on a model represent 1/4 inch, then how many feet represent 1 inch
what expression can be used to find the total discount $42 30%
lesson 7 homework practice convert measurment unit
The correct option is d. 8 oz. can of juice is most convenient to meet this requirement.
First, let's convert 240 milliliters to ounces because the answer choices are in ounces.
1 milliliter is approximately equal to 0.0338 ounces.
So, 240 milliliters is approximately \( 240 \times 0.0338 \) ounces, which is about 8.112 ounces.
Now, let's examine the options:
a. 5 oz. can of juice: Not enough juice. It's less than the required 8.112 ounces.
b. 4 oz. can of juice: Not enough juice. It's less than the required 8.112 ounces.
c. 12 oz. can of juice: More than enough juice. It's more than the required 8.112 ounces.
d. 8 oz. can of juice: Exactly the amount needed. It matches the required 8.112 ounces.
Since the resident is supposed to have 240 milliliters of juice every 2 hours, and 240 milliliters is approximately 8.112 ounces, the closest can size that would meet this requirement without being wasteful is an 8 oz. can. The 5 oz. and 4 oz. cans would not provide enough juice, and the 12 oz. can would provide more than necessary, potentially leading to waste or overconsumption. Therefore, the 8 oz. can is the most convenient and appropriate choice.
What number does ▲ stand for in this equation?
6 × 3 = (▲ × 5) – (▲ × 2)
what is the answer to 38-19+12
To solve the expression 38-19+12, we subtract 19 from 38, resulting in 19, and then add 12 to get an answer of 31.
To solve the expression 38-19+12, we should follow the proper order of operations, which in this case, simply requires us to perform the subtraction and addition in the sequence they appear from left to right. First, subtract 19 from 38, then add 12 to the result.
Subtract 19 from 38, which equals 19 (38 - 19 = 19).
Add 12 to the result from step 1, which gives us 31 (19 + 12 = 31).
Therefore, the answer to the expression is 31.
help asap i raised to 15 points so plz help and i want clear answer The rental rate for a cement mixer has a flat rate of $40 plus $20 for each day of the rental. The graph shows points representing the total cost of the rental.
Which linear equation, in slope-intercept form, that models the total cost of the rental over time?
a y=x+50
b y=25x
c y=20x+40
d y=50x+25
e y=75x
Lyza has a 9 inch board. She wants to measure the length of a small rug in feet. How can she do this?
The length of a small rug in feet is 0.75.
What is division?The division in mathematics is one kind of operation. In this process, we split the expressions or numbers into the same number of parts.
Given:
Lyza has a 9-inch board.
She wants to measure the length of a small rug in feet.
For that,
divide the length by 12 inches.
Measure of the small rug,
= 9/12
= 0.75 feet.
Therefore, 0.75 feet is the small rug.
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23×42+ 12×23+23×23+12×32
Answer:
2,155
Step-by-step explanation:
A boa constrictor is 18 inches long at birth and grows 8 inches per year. Write an equation that represents the length Y (in feet) of a boa constrictor that is X years old.
This is writing equations in slope intercept form and I tried y=8x+18 but it didn't work.
Final answer:
The length Y (in feet) of a boa constrictor that is X years old is given by the equation Y = 0.6667X + 1.5. This equation takes into account the initial length of 1.5 feet at birth and an annual growth of 0.6667 feet.
Explanation:
To write an equation representing the length Y (in feet) of a boa constrictor that is X years old, we need to start with its initial length at birth and account for its growth over the years. The boa constrictor is 18 inches long at birth and grows 8 inches per year. However, we want Y to be in feet, so we must convert these measurements from inches to feet (since 1 foot = 12 inches).
To convert the initial length from inches to feet, we divide 18 inches by 12, which gives us 1.5 feet. The annual growth should also be converted from inches to feet by dividing 8 inches by 12, resulting in approximately 0.6667 feet.
So, using slope-intercept form (Y = mx + b), our equation is:
Y = 0.6667X + 1.5
This equation states that the boa constrictor starts with a length of 1.5 feet at birth (Y-intercept) and grows about 0.6667 feet for every year that passes (the slope).
lee walked a total of 4.48 miles. he walks 1.4 miles each hour. how long did lee walk?
Antoine and 3 friends divide some pennies evenly among themselves. Each friend separates his pennies into 3 equal stacks with 5 pennies in each stack. write a multiplication sentence that shows
Answer:
4 × ( 3 × 5 ) = 60
Step-by-step explanation:
Answer:
4 × (3 × 5) = 60
Step-by-step explanation:
Total number of persons including Antony = 4
Number of stacks separated by each friend = 3
Number of pennies in each stack = 5
Number of pennies in all 3 stacks of one friend = 3 × 5
Number of pennies in all 3 stacks of 4 persons = 4 × (3 × 5) = 60
Hence, the multiplication sentence is 4 × (3 × 5) = 60.
is this scientific notation? 0.99×10^12
is 3/2 and 18/8 proportional
What is the length of the hypotenuse?
Marco has a jug with 37 1/2 ounces of juice .he wants to use some small cups to pass out as samples of the juice .each cup holds 2 1/2 of juices .how many cup can Marco fill with juice samples
When adding 51.2 to a certain number, the sum is 56.05, as seen below. What number should go in the box to complete the addition problem?
If hot dog buns come in packages of 6 and hot dog buns come in packages of 8 what is the least number of hot dog and buns you could buy to have the same number of hot dogs and buns?
What percent of 60 is 15
9 and 3/4 divided by 4 and 1/8 as a fraction or mixed number in simplest form
Replace each with <, >, or = to make a true sentence.
–6 −4
slope slopeeeeeeee slopeeee
Write an equation in slope intercept form for the total cost of any number of tickets at 7 tickets for $5
balance the equation out by filling in the blank for the missing number
89 - 45 = 90 - ____
with an examle
Members of the Blade runners skating club collected $950 from fundraising activities.They want to buy Altrablade skates, which are $48 a pair. How many pairs of skates can they buy? What does the remainder represent
Answer:
19 pairs
need 21% of $48 to buy 20th pair
Step-by-step explanation:
If the members collected $950 and they want to by Altrablade skates for $48 a pair, the amount of pairs of skates can be determine by dividing the total amount collected by the cost per skates:
[tex]950/48=19.79=19[/tex]
They can buy 19 pairs of skates by the remainder is 0.79. This represents the amount still needed to buy the 20th pair of skates. So they would need 21% of the $48 to buy a extra pair.
compare the ratios 9/2 and 10/7
Atlantic Auditorium has 850 seats. Tickets were sold for 816 of the seats. For what percent of the seats were tickets sold?
Answer:
96%
Step-by-step explanation:
Just divide 850 and 816 and you will get 0.96 which is 96 %.