Question

Directions: Evaluate each rational expression using the indicated values of the variable.

1.
`(5x)/(2y)`
a. when x = 8 and y = 10
b. when x = 1/2 and y = 2/3

2.
`\frac{ {ab}^(3) }{c}`
a. when a = 4, b = 3, and c = 2
b. when a = -2, b= -2, and c = 2
3.
`(e \: + \: 5)/(4f \: - \: 4)`
a. when e = 11 and f = 7
b. when e = -1 and f = -4​

Pls answer it perfectly, so there will be no reported answers, thank u :)​

Answer 1

`1) \: \: (5x)/(2y) \\ a) \: \: x = 8 \: \: and \: \: y = 10 \\ (5x)/(2y) \\ (5(8))/(2(10)) \\ (40)/(20) \\ 2 \: ans \\ b) \: \: (5x)/(2y) \\ (5( (1)/(2)) )/(2( (2)/(3)) ) \\ (2.5)/(1.3) \\ (25)/(13) \\ 1.92 \: \: ans \: \\ \\ 2) \: \: \frac{a {b}^(3) }{c} \\ \\ a) \: \: a = 4 \: .\: b = 3 \: . \: c = 2 \\ \\ \frac{a {b}^(3) }{c} \\ \frac{(4) {(3)}^(3) }{2} \\ (4(27))/(2) \\ (108)/(2) \\ 54 \: \: ans \: \\ \\ b) \: \: a = - 2 \: . \: b = - 2 \: . \: c = 2 \\ \\ \frac{a {b}^(3) }{c} \\ \frac{( - 2) {( - 2)}^(3) }{2} \\ \frac{ - 2 { (- 2)}^(3) }{2} \\ ( - 2( - 8))/(2) \\ (16)/(2) \\ 8 \: \: ans \:`

Explanation:

question 3 is already answered by me in your question..or you can see attachment.