please help me with algebra homework?

Question

18.heidi ,a jewelry salesperson,earns a commission of $55 every time she sells a diamond ring.how many rings does she have to sell to earn $605?choose the equation that correctly
calculates the amount.
a.$55+w=$605
b.$605-$55=w
c.$55xw=$605
d.$55-w=$605-w

10.according to the wall street jou rnal,14,200,00 videotape copies of walt disneys fantasia have been sold to date.write that number in scientific notation.
a.142x1,000,000


6
b. 1.42x10

7
c.1.42x10
7
d. 142x10

Answer 1

18. What w represents is the number of rings Heidi has to sell to earn $605. What do you have to do, add/subtract, or multiply/divide?

10. In scientific notation, the first number must be between 1 and 10. Which can you eliminate? Then, how many times must you move the decimal to get from the number you have to 14,200, 000?

Answer 2

Ok for your first question it would be C. 55xw=605 - Here is why, If you have the total number and she has to sell it to get the total number you have to (*) to get the total. Because to find the missing number you must (/). so the reverse equation to find the missing number would be 605/55=W
Now for the second one that is a little more tricky so I am giving you a website to help. I think it is D. But don't hold me to that

Answer 3

18. c.$55xw=$605

10. 7
c.1.42x10
I assume this should be 1.42x10 to the 7th power or 1.42x10^7

Answer 4

question 18 should be c because w stands for the number of rings she sold

but about question 10 i'm not sure about the answer cause if i'm not wrong it should be 1.42 x 1,000,000. but for your choice a) you type 142 so if you miss out the . the answer should be a)

hopes it helps :)

Answer 5

18. c
19 1.42X10^7

Answer 6

The other answers can work too but another way u can write it is 2 (2s+2). If u distribute that it comes out to 4s+4.