Question

The price for a gallon of super unleaded gasoline is $0.12 more than the price for a gallon of regular unleaded gasoline. Let g represent the price or regular unleaded gasoline. write an algebraic expression for the price of super unleaded gasoline @michele_Laino

Answer 1

If I call with \(s\) the price of super unleaded gasoline, and with \(r\) the price of regular unleaded gasoline, then your problem can be modeled by this equation:
\(s=r+0.12\)

Answer 2

oops.. using the symbol in the text, I can write this:
\(s=g+0.12\)

Answer 3

thank you so much, i have one more last question

Answer 4

ok!

Answer 5

how many liters of a 15% salt solution must be added to 2 liters of a 30% salt solution to yield a solution that is 18% salt

Answer 6

I call with \(x\) the requested volume in liters

Answer 7

so the total volume is \(x+2\), am I right?

Answer 8

after dilution, of course

Answer 9

i got 1.82 :(

Answer 10

I'm sorry, i think that it is wrong

Answer 11

i did
.15x+.30(2)=.18(x+.30)

Answer 12

correct!

Answer 13

If I multiply by 100, both sides, i can write this:
\(15x+60=18(x+2)\)

Answer 14

so you get 15x+60=18x+2

Answer 15

please note this:
I apply the distributive property of multiplication over addition at the right side, so i can write this:
\(15x+60=18x+36\)

Answer 16

since: \(18 \cdot 2= 36\)

Answer 17

ok?

Answer 18

we subtract 15 from both sides and then will end up with 60=3x+60

Answer 19

sorry we will end up with 60=3x+36

Answer 20

we subtract \(15x\) from both sides, so we have this:
\(60=18x-15x+36\)

Answer 21

and we will subtract the 36 from both sides to solve for x

Answer 22

yes! we get:
\(60-36=18x-15x\)

Answer 23

we will end up with 24=3x

Answer 24

correct!

Answer 25

divide by 3 both sides will get 8

Answer 26

??

Answer 27

yes! correct!

Answer 28

so 8 is the answer?

Answer 29

yes!

Answer 30

\(8\) liters, of course

Answer 31

thank u so much

Answer 32

:)

Answer 33

story problems are soo annoying, i always have hard time solving them :(

Answer 34

no problem, here at OpenStudy we will help you! :)

Answer 35

thanks :)

Answer 36

:)

Answer 37

Car A and Car B enter an expressway at the same time and place, and head the same direction. Car A travels at 70 miles per hour. After 2.5 hours, car B is 50 miles behind car A. at what speed is car B traveling? I got 50mph for the final answer, is it right?

Answer 38

after 2.5 hours car A has traveled a distance of \(70 \cdot 2.5=175\) miles, and car B has traveled a distance of \(175-50 =125\) miles. So the speed of car B is: \(v=125/2.5=50\) miles/hour,
so you are correct!

Answer 39

good! thanks :)

Answer 40

:)

Answer 41

Celine purchased a fedora. the cost o the fedora, including a 15% tax, was $ 316.25. find the cost of the fedora before tax,,, i got 268.8125 is that right?

Answer 42

i multiplied .15 by 16.25= 47.4375 and then i subtract 316.25-47.4375

Answer 43

i got 268.8125

Answer 44

i got 268.8125

Answer 45

i multiplied .15 by 16.25= 47.4375 and then i subtract 316.25-47.4375