A scientist has two solutions, which she has labeled Solution A and Solution B. Each contains salt. She knows that Solution A is 45% salt and Solution B is 70% salt. She wants to obtain 90 ounces of a mixture that is salt. How many ounces of each solution should she use?

step-by-step explanation:

the first 5 right here the next 5 i will upload as separate question

answer is 144

step-by-step explanation:

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

the answer is a if my teacher taught me correct