Ihave this problem, on my math here's what it says:
5-84
a. use the numbers 7,5,6 and 3, only once each to create an expression that equals 75. you may use addition, subtraction, multiplication and/or division, but you must use parentheses.
b. now use the distributive property to write and equivalent expression without parentheses. (you may use the numbers more than once or use different digits for this part only.)
if, you have the answer mark this a. and b. for me.
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mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

describing distributions is one of the key skills you’ll need to earn a high score on the ap statistics exam. if you need proof of this, just flip through some past exam questions, which can be found at the collegeboard website. you’ll notice that the first free response question is almost always a question requiring you to look at a graph and describe it.

step-by-step explanation: just trying to get points sorry : (

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify