Set the two values equal to each other with 18x-2=12x+2 and then plug it in to the equation and solve
Answer:
he needs to get a 91 to have a mean score of 90
Step-by-step explanation:
add up all the known scores to get 629
let 's' = lowest test score
(629 + s) ÷ 8 = 90 [we divide by 8 because there are 7 known and 1 unknown score)
cross-multiply to get:
629 + s = 720
s = 720-629
s = 91
Answer:
12
Step-by-step explanation:
the opposite of -12 is 12
Answer:
4\pm\sqrt{19}
Step-by-step explanation:
Move everything to left side

Now to solve this square equation we need to find Descriminant

As Descriminant D is greater than 0 then we have 2 solutions which we can calculate by this formula

Answer:
.05
Step-by-step explanation:
to get a percent, you multiply by 100. so take 5 and divide by 100 to get decimal