Convert as indicated what is the aswer?

1. the meeting hall in the union has 4500 sqre.ft.of floo space. convert this to squre. yrds.

SOLVE THE PROBLEM
2. A formula for the focal length of a lens is f=ab all over b+a. Calculate f (the focal length) when a =12cm and b=17cm. Round to the nearest tenth of a centimeter when necessary.

3. A baker can decorate the day's cookie supply four times as fast as his new assistant. if they decorate all the cookies working together in 12 min., how long would it take for each of them to decorate the cookies working individually?

1. One yard = 3 ft. One yard squared is 9 ft squared.
4500 divided by 9 = 500 sq yards.

2. 12 x 17 = 204 sq cm
12 + 17 = 29 cm
Dividing the two.. we get ~7 cm.

3. Let b be the rate of the baker and a be the rate of the assistant.

b = 4a, a = b/4
t divided by (b + a) = 12

We must solve for t/b and t/a.

t/(4a + a) = 12
t/5a = 12
t/a = 60 min

t/(b/4) = 60
t/b = 15 min

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