43= 2x-7 43+7=50 50/2=25 X=25
Answer:
a,c,e
Step-by-step explanation:
Answer:
She'd have to work for 12 hours.
Step-by-step explanation:
100 ÷ 9 = 11.11
Rounded up its 12
It would be 12 songs.
Divide 24 by 200.
24÷200=0.12
Multiply by 100 because percentages are out of 100.
0.12×100= 12
12%
13.15 ounces of 72% acid and 71.85 ounces of 25% acid are needed
<u>Step-by-step explanation:</u>
Total mass of acid required= 85 ounces
Let the mass of 72% acid be 'a'
Let the mass of 25% acid be 'b'
a + b = 85
b = 85-a
85(40/100) = a(72/100) + b(25/100)
85(2/5) = a(72/100) +(85- a) (25/100)
34 = (72a/100) + (2125/100) - (25a/100)
34 - (2125/100) = (72a + 25a) /100
(3400-2125)/100 = 97a /100
97a = 1275
a = 13.15 ounces
b = 85 - 13.14
b = 71.85 ounces
13.15 ounces of 72% acid and 71.85 ounces of 25% acid are needed
