Answer:
a. 47
b. 87
c. 127
Step-by-step explanation:
Assume a total of 4 exams ( first 3 plus a final)
Let final score be X,
Hence, average score = (85 + 71 + 77 + x) / 4 = (233 + x) / 4
a) to get a C, the average score must be 70
70 = (233 + x) / 4
(233 + x) = 70 (4) = 280
x = 280 - 233 = 47 (Ans)
b) to get a B, the average score must be 80
80 = (233 + x) / 4
(233 + x) = 80 (4) = 320
x = 320 - 233 = 87 (Ans)
c) to get a A, the average score must be 90
90 = (233 + x) / 4
(233 + x) = 90 (4) = 360
x = 360 - 233 = 127 (Ans)
Answer:
(15, 11)
Step-by-step explanation:
(I'm assuming you are solving for x and y.)
Plug in the x equation:
4(2y - 7) + y = 71
8y - 28 + y = 71
9y - 28 = 71
9y = 99
y = 11
Then plug that answer into the other equation:
x = 2(11) - 7
x = 22 - 7
x = 15
You can check by doing the following to make sure you are right:
15 = 2(11) - 7
15 = 22 - 7
15 = 15
4(15) + 11 = 71
60 + 11 = 71
71 = 71
Answer:
12
Step-by-step explanation:
the length of one leg of the given isosceles triangle is 12.
we get it by using pythagorous theorem
Answer:
$75.25
Step-by-step explanation:
x will be how much money chris needs to raise. set up the problem like this:
=
cross multiply: 100x = 7525
divide each side by 100: x = 75.25
Answer:
16
Step-by-step explanation:
its a cube, so all the sides are 16.
hope you pass surface area it has ALOT of formulas ( :