Josephine is taking a college course, and her professor bases the course grade on the average of two test taken in the semester. She wants to know what she needs to earn on the last test to maintain her grade. Rearrange the following questions for b, where C is the average of two test scores, a and b. (9th-grade Algebra 1)

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

the answer should be:

a. 3, 4, and 6

b. 18, 24, and 36

c. 4.8, 6.4, and 9.6

hope i

-lavira : )

yes i do see that. i say this because i am doing my very best in high school so i can get a scholarship and credits.  

the answer is b.

surface area: 169π

volume: 366π

i got it down.