Write a rational expression for the total time of the boat trip.

Question

A boat travels through still water at x miles per hour. The water in a river flows down stream 4 miles per hour. The boat travels on the river 15 miles upstream and then returns downstream. The rate of the boat travels upstream x-4 miles per hour because the boat moves against the flow of water. The rate the boat travels down stream is x+4 miles per hour because the boat moves with the flow of water.

Answer 1

write the ratioal expression in lowest terms.

1.    5k^2-5k/ 7k-7

2.    2t-10/ t^2 -25

       2t-10/t^2-25=

Answer 2

write the rational ecpressoion in lowet terms.

z^2-11z+30/z^2+4z-45

z^2-11z+30/z^2+4z-45=

(simplify the answer)

Answer 3

1. write the expression in lowest terms

7-v/v-7

7-v/v-7 =

(simplify the answer)

2. perform the indicated operation. simplify if possible.

w^2/w+3 - 9/w+3

w^2/w+3 - 9/w+3 =

Answer 4

1. add and reduce to lowest terms, if possible

4/t + 14/3r

4/r + 14/3r =

2. perform the indicated operations

2x/x-5 + 100/x^2 -25 -2x/x+5 =

Answer 5

1. subtract.

3/x^2 -6x+5 - 3/x^2-2x+1=

2. use any mothod to sublify the complex fraction.

20/ x-2 /12 / x =

Answer 6

1. simplify the conplex fraction.

1/x +8 / 1/x -5 =

2. simplify, using only poaitive exponents in the answer

x^-3 +y^-5/x^-2 +y^-1 =

Answer 7

1. solve the equation.

-5/3x +13/6x = -3/6

solvie the correct chioce below and, if neccessary, fill in the answer box to complete your chioce.

a. the solution set is. (  )

b. the solution set it no solution

 

2. solve the following equation

1/y-2 +1/4 =-5/2y-4

solve the corrrect chiooce below and, if neccessary, fill in the answer boc witin your choice.

a. the solution set is ( )

b. there is no solution

Answer 8

solve:

1/x+4 + 3/x+8 =4/x^2 +12x +32

a. the colution set is (  )

b. there is no solution

Answer 9

1. A gas law in chemisstry saya that PV/T = pv/t

suppose thta T=300, t=375, V=9, P=40 and v=8. fine p.

Answer 10

Write each rational number a/b. 5,1/6