Allie gaiter needs to study a star for her astronomy research project. she has narrowed her choices down to four stars and wants to study the one that is farthest from earth. a-0.176*10^18 / b- 22.13*10^16 / c - 31.42*10^16 / d- 125.5*10^15

 C

Step-by-step explanation:

Convert each option into scientific notation (Only one digit between 1 and 9 before the decimal point).  If you move the decimal place to the left, move the exponent that many units to the right.  If you move the decimal place to the right, move the exponent that many units to the left.

Since they are all (× 10¹⁷), we can compare the digits:

1.76      2.213      3.142       1.255

The largest one is 3.142 so C is the answer.

the final amount you will pay is $68.04.

the tip is determined by the pre-tax amount, so we calculate the tip based on the original bill, not after we've added sales tax.

to find the tip:

we can divide 54.00 by 100 to get 1% of 54. then we multiply that by 18.

54 / 100 = .54

.54 x 18 = 9.72

tip = 9.72$

to find the tax:

we can divide 54.00 by 100 to get 1% of 54. then we can multiply that by 8 to get 8%.

54 / 100 = .54

.54 x 8 = 4.32

tax= 4.32

now we can add the tip and tax to the bill to get our total.

54 + 9.72 + 4.32 = 68.04

total: $68.04

step-by-step explanation:

b and c

step-by-step explanation: