Step-by-step explanation:

7x/x-4 * x/x+7
mutiply the numerators together
(7x)(x)= 7x^ 2
mutiply the denominators together
(x-4)(x+7)
(x)(x)(7)(x)= x^2+7x
(-4)(x)(-4)(7)= -4x-28
x^2+7x-4x-28
x^2+3x-28
Answer:
7x^2/x^ 2+3x-28
Answer:
multiply the original coordinate by 3 so its c
Step-by-step explanation:
multiply the original coordinate by 3
220miles / 4 hours = 55 miles/hr
55mi/hr x 7hrs = 385 miles