11. Air is pumped into a spherical balloon such that the surface area of the balloon increases at a rate of 10 cm² per second. Find the rate at which the radius is increasing when the radius is 4 cm. [i. e. find dr/dt when r=4] [Note : surface area, A = 4pi r2]​

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?

10 points? ? +++ me asap gabriella uses the current exchange rate to write the function, h(x), where x is the number of u.s. dollars and h(x) is the number of euros, the european union currency. she checks the rate and finds that h(100) = 7.5. which statement best describes what h(100) = 75 signifies? a) gabriella averages 7.5 u.s. dollars for every 100 euros. b) gabriella averages 100 u.s. dollars for every 25 euros. c) gabriella can exchange 75 u.s. dollars for 100 euros. d) gabriella can exchange 100 u.s. dollars for 75 euros.