In eight hours, and experienced cook prepares enough pies to supply a local restaurants daily order. another cook prepares the same number of pies in nine hours. together with a third cook, they prepare the pies in two hours. find how long it takes the third cook to prepare the pies alone.

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1

if you mean

then it's c. 8, -7/3

but if you mean

then it is

answer is  

a.

p = 78

step-by-step explanation: