Which of the following is an identity?
a. csc^2 x + cot^2 x = 1
b. (cscx + cotx)^2 = 1
c. sec^2 x sec^2 x + 1 = tan^2 x csc^2 x
d. sin^2 x - cos^2 x = 1

do you mean add both of the equations together

because if you do the answer is 10x-5

step-by-step explanation:

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you