Answer:
Step-by-step explanation:
A
1/2 + 3/x = 3/4
3/x = 3/4 - 1/2
3/x = 3/4 - 2/4
3/x = 1/4....this is a proportion, so we cross multiply
(1)(x) = (3)(4)
x = 12
check..
1/2 + 3/12 = 3/4
6/12 + 3/12 = 3/4
9/12 = 3/4
3/4 = 3/4 (correct)
so x = 12
Answer:
22.50
- 15.00
_______
7.50
Step-by-step explanation:
She still owes $7.50
n - 12 = -9
Add 12 to both sides to isolate the variable n.
n = -9 + 12
n = 3
B) n = 3
C. 2.5 hours
95 miles/x h = 38 miles/h
x = (95 miles/h)/(38 miles) = 2.5 hours
