Given sin(−θ)=−1/4 and tanθ=√15/15 . what is the value of cosθ ?

Step-by-step explanation:

Given that and

Using those values we need to find value of

So let's begin with equation of   and simplify it to get value of  

 {since }

Step-by-step explanation:

The sine function is an odd function, that is:

Then,

The cosine function is computed by the following relation:

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