We can use a rule of three simple, direct proportion to solve this problem.
15 pounds correspond to $1.80, then the question is to find the price of one pound, the called unit rate. We state the rule of three:
15 pound ----> $1.80
1 pound -----> x
x = (1)(1.80)/15
x = 0.12
Therefore, each pound costs $0.12 that is the unit rate in pounds
It’s b because if Mandy goes 18 days and her friend goes 3 times the days she goes.
Im not sure why you said ur wrong b/c i got the same answer
f(x) = -15+ 7
f(x) = -8
