Answer: 2x-3=15
2(9)-3=15
18-3=15
I don’t know don’t ask me
Answer: Hassan's expression:
d = original price
0.25d = amount of discount
d-0.75d= sale price of the book
Bella's expression
0.75d = sale price of a book
Step-by-step explanation:
Hi, to answer this question we have to analyze the information given:
d = original price in dollars
25% off = 0.25 in decimal form ( 25/ 100 = 0.25)
Hasan's expression:
d−0.25d
In this expression 0.25d is the amount of discount , and d is the original price.
For example :
If a book costs $100 (original price) :
sale price =100 - (0.25 x 100)
sale price=100- 25
sale price=75
Bella's expression:
0.75d
in this expression 0.75d is the sale price ( d is the original price and since the percent discount is 0.25 it can be expressed as a 0.75 of the original price since 100-25=0.75)
Answer:
First car: 30 gallons
Second car: 35 gallons
Step-by-step explanation:
Hi, to answer this question we have to write a system of equations:
Total gas consumption was 65:
x+y=65
Where:
x = gallons consumed by the first car
y = gallons consumed by the second car
The first car has a fuel efficiency of 20 miles per gallon of gas and the second has a fuel efficiency of 30 miles per gallon of gas, the two cars went a combined total of 1650 miles:
x 20+y 30 = 1650
The system is:
x+y=65 (1)
x 20+y 30 = 1650 (2)
Isolating y on (1)
y = 65-x
Replacing y= 65-x on (2):
x 20+(65-x)30 = 1650
20x +1,950-30x= 1650
20x-30x= 1650-1950
-10x= -300
x= -300/-10
x = 30 gallons
Back to (1)
y =65-x
y =65-30
y= 35 gallons
Feel free to ask for more if needed or if you did not understand something.