Find the least common denominator for the following rational expressions. (r – 1)(r – 4)(r – 5) (r – 1)(r + 4)(r – 5) (r – 1)(r + 1)(r – 4)(r – 5) (r – 1)(r + 1)(r + 4)(r – 5)

(r - 4)(r - 1)(r - 5)(r + 1)

Step-by-step explanation:

We can simply look at the denominators and factor them.

First: (r - 4).

Second: (r - 4) (r - 1).

Third: (r - 5)(r + 1).

In order to find the LCD, simply create a common denominator.

The smallest value that would make this rational expression have a common denominator would be:

(r - 4)(r - 1)(r - 5)(r + 1).

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: