The bar graph shows the recommended number of hours of sleep for each age group. How many hours of sleep are recommended for elementary-age children?
A. exactly 9 hours
B. exactly 10 hours
C. about 10 hours
D. about 12 hours

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Zoey made 5 1/2 cups of trail mix for a camping trip. she wants to divide the trail mix into 3/4 cup servings. a. ten people are going on the trip. can zoey make enough 3/4 cup servings so that each person gets one serving? b. what size would the servings need to be for everyone to have a serving?