Answer:
84
Step-by-step explanation:
The sum of the differences of the current scores from average is ...
(84 -85) +(92 -85) +(71-85) +(94 -85) = -1 +7 -14 +9 = 1
So, to make the total of all differences from average be zero, Steve must get a score of 85 -1 = 84 on his 5th test.
Let the necessary amount of water be x. Then (1.00)(1 gallon antifreeze) = 0.40(x+1 gallon), or 1 = .40x + .40. Combining like terms: 0.60 = 0.40x.
Then x = 0.60 / 0.40 = 1.5.
Adding 1.5 gallons of water to that 1 gallon of pure antifreeze results in 2.5 gallons of 40% antifreeze.
That's no math so you don't need an answer
Answer:B
Step-by-step explanation: