She worked 9 hours at baby-sitting and 6 hours at her parents store.
Step-by-step explanation:
Let,
Baby-sitting hours = x
Hours at parents store = y
Total hours = 15
Amount earned = $93
According to given statement;
x+y=15 Eqn 1
5x+8y=93 Eqn 2
Multiplying Eqn 1 by 5;

Subtracting Eqn 3 from Eqn 2;

Dividing both sides by 3;

Putting y=6 in Eqn 1

She worked 9 hours at baby-sitting and 6 hours at her parents store.
Keywords: linear equations, subtraction
Learn more about linear equations at:
#LearnwithBrainly
There is 150% increase in the number of volunteers.
Step-by-step explanation:
Given,
Old number of volunteers = 20
New number of volunteers = 50
Change = New value - Old value
Change = 50 - 20 = +30
The positive sign indicates the increase.
Percent increase = 

There is 150% increase in the number of volunteers.
Keywords: percentage, subtraction
Learn more about percentages at:
#LearnwithBrainly
Answer:
A=104
Step-by-step explanation:
x=14 so u plug that into angle A's equation
Answer:
0.91666666666
Step-by-step explanation:
if its wrong tell me
To find a percent of a number, multiply the percent by the number.
First we find the number of pennies.
40% of 220 =
= 40% * 220
= 0.4 * 220
= 88
88 coins are pennies.
220 - 88 = 132
132 coins are not pennies.
Now we find 25% of 132.
25% of 132 =
= 25% * 132
= 0.25 * 132
= 33
33 coins are partners.
(Did you mean quarters instead of partners?)