Answer:
a = 22
Step-by-step explanation:
We know that YB is the altitude. An altitude basically just means a line straight through the middle. Since we know the measurements of both sides we can solve for a. XB=BZ, so if you solve a + 7 = 2a - 15, then you get your answer.
Answer:
A
Step-by-step explanation:
Answer:
16y+7z
Step-by-step explanation:
9y+7y is 16y
11z-4z is 7z
Multiply the total hours by each portion:
Ally = 60 hours x 0.4 = 24 hours.
Megan = 60 x 1/4 = 60 x 0.25 = 15 hours.
Rachel and Liz = 60 hours - 24 hours - 15 hours = 21 hours total.
Rachel and Liz shared equally so 21 / 2 = 10.5 hours each.
Liz babysat 10.5 hours ( 10 and 1/2 hours).