Find the value of x root (4/7)^2x-1=16/49

Step-by-step explanation:

Given expression:

                        =

  Solve for x;

Solution:

    16  = 4²

   49 = 7²

  So;

             =

            =

     Now;

              2x - 1 = 2

              2x = 3

                x  =

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.