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3 years ago

Which phrase describes an unknown or changeable quantity/

1 answer:

6 0

Answer:
C. 2 times the number of pages in the book

Explanation:
The number of pages of the book may vary or can change depending on the book

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Use rounding to estimate the product

sdas [7]

Answer:

The estimate of the product is about 35 answer C

Step-by-step explanation:

- We use rounding to estimate the product of two fractions

- The mixed number has whole number and fraction

- To round the mixed number we look to the fraction

- If the numerator is half or greater than half the denominator, then we

add the whole number by 1 and cancel the fraction

- If the numerator is less than half the denominator, then we keep the

whole number as it and cancel the fraction

- Ex: If the mixed number is $2\frac{3}{4}$ , 3 is more than

half 4 then we will add 2 by 1 and cancel the fraction part, the

mixed number $2\frac{3}{4}$ after rounding is 3

- Ex: If the mixed number is $5\frac{1}{4}$ , 1 is less than

half 4 then we will keep 5 as it and cancel the fraction part, the

mixed number $5\frac{1}{4}$ after rounding is 5

* Lets solve the problem

∵ In the part $4\frac{3}{4}$ 3 is more than half 4

∴ The rounding value of $4\frac{3}{4}$ is 5

∵ In the part $7\frac{2}{17}$ 2 is less than half 17

∴ The rounding value of $7\frac{2}{17}$ is 7

∴ $4\frac{3}{4}*7\frac{2}{17}=5*7=35$

* <em>The estimate of the product is about 35</em>

6 0

2 years ago

Bob has 200 coins in her piggy bank. Of those 40%are pennies. Out of the coins that are not pennies 25% are quarters. How many o

nadezda [96]

Answer: 200 x .40 = 80 (there are 80 pennies)

200 - 80 = 120

120 x .25 = 30 (there are 30 quarters)

Step-by-step explanation:

7 0

2 years ago

Read 2 more answers

A car is traveling at a rate of meters per second. What is the car's rate in kilometers per hour? How many kilometers will the c

jenyasd209 [6]

Answer:

- The car's rate in kilometers per hour is 108 kilometers per hour

- The car will travel 540 kilometers in 5 hours

Step-by-step explanation:

Here is the complete question:

A car is traveling at a rate of 30 meters per second. What is the car's rate in kilometers per hour? How many kilometers will the car travel in 5 hours? Do not round your answers.

Step-by-step explanation:

To determine the car's rate in kilometers per hour, we will convert 30 meters per second to kilometer per hour.

1000 meters = 1 kilometer

∴ 1 meter = 0.001 kilometer

3600 seconds = 1 hour

∴ 1 second = 1/3600 hour

Therefore,

$30 meters/ second$ = $\frac{30 \times 0.001 kilometer}{1/3600 hour}$

= $\frac{30 \times 0.001 \times 3600 kilometers}{1 hour}$

= 108 kilometers / hour

Hence, the car's rate in kilometers per hour is 108 kilometers per hour.

To determine how many kilometers the car will travel in 5 hours, that is we are to determine the distance covered by the car in 5 hours.

From the formula

Speed = Distance / Time

∴ Distance = Speed × Time

(NOTE: Speed is also known as rate)

Speed (Rate) = 108 kilometers / hour

Time = 5 hours

∴ Distance = Speed × Time gives

Distance = 108 × 5

Distance = 540 kilometers

Hence, the car will travel 540 kilometers in 5 hours.

7 0

3 years ago

Jill is dividing 23 by 9. If she continues the process, what will keep repeating in the quotient?

Westkost [7]

Answer:

23 divide by 9 =2.55555555556

Step-by-step explanation:

8 0

1 year ago

Read 2 more answers

Tighe starts at sea level and hikes up to an elevation of 70 ft. Then he descends(walks down) in the direction of his starting p

gulaghasi [49]

Answer:

no -20

Step-by-step explanation:

maths

6 0

2 years ago

Read 2 more answers