Introducing Ratios: Question 7 Liz earns $7 per hour to baby-sit for the Cochran family.
How many hours does she have to baby-sit to earn $28?
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4 hours

Step-by-step explanation:

Divide the money she wants to make by the amount she makes per hour.

Goal: 28

Hourly: 7

28 ÷ 7 = 4

So she needs to work for 4 hours.

Hope that helped you! :)

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared