The surface area, S, of a sphere of radius r feet is S = S (r) = 4πr2. Find the instantaneous rate of change of the surface area with respect to the radius r at r = 4.

a. 32pi

b. 16pi

c. 64pi

d. 4pi

What is 10 more than 56

Solve x squared+5x+6=0

Twenty-five percent of students at Marcus Garvey Middle School bring their lunches from home. 225 students do not bring their lunch.

A model boat is 13.2 inches long. The scale of the model to the original is 2 inches : 5 feet. How long is the boat?

75dollars with a 10 percent sales tax

A survey determined that 7/18 of the seventh grade students at Mills Middle School preferred round chocolate candies to hard candy. When Jennifer duplicated the survey, 1/9 of the students changed their preference from chocolate candy to hard candy.

Which situation is linear? A. A sample of bacteria is doubting every day B. The number of cars each hour on a road for a week C. The cost of a movie ticket increases five percent each year D.

Kari is flying a kite. She releases 50 feet of string. What is the approximate difference in the height of the kite when the string makes a 25o angle with the ground and when the string makes a 45o angle with the ground? Round to the nearest tenth.

The population of a city is 2,500. If the number of males is 240 more than the number of females, how many males and females are there in the city?

Which expression could be used to determine the cost of a $40 video game after a 15 percent discount?