Answer:
Step-by-step explanation:
Hi there!
Begin by distributing the 5:
5(2x) + 5(-12) = -90
Simplify:
10x - 60 = -90
Add 60 to both sides:
10x = -90 + 60
10x = -30
Divide both sides by 10:
x = -3
Answer:
Step-by-step explanation:
(85+92+95+x)/4
=90
(272+x)/4
=90
90×4=360
272+x=360
x=360-272=88
so it's the lowest score
Answer:
12 CDs and 15 DVDs
Step-by-step explanation:
Let
x----> the number of CDs
y---> the number of DVDs
we know that
x+y=27 -----> x=27-y ----> equation A
15x+19y=465 ----> equation B
Solve by substitution
substitute equation A in equation B and solve for y
15(27-y)+19y=465
405-15y+19y=465
4y=465-405
4y=60
y=15 DVDs
Find the value of x
x=27-y
x=27-15=12 CDs