Question

Find the value of x, given cos 0 = 0.4

PLEASE HELP!!!!!! And explain if possible

Answer 1

`x=30`

Explanation:

For each right-angled triangle:

`\cos\theta=(cathetus \ adjacent \ \theta)/(hypotenuse)`

Because
`\cos \theta=0.4, \ \ cathetus\ adjacent \ \theta \ = \ 12, \ \ \ hypotenuse=x`

we have an equation

`0.4=\frac{12}x`

multiplying both sides by x, we get
`0.4x=12`

dividing both sides by 0.4 and
`x=(12)/(0.4)`

using calculator, we divide 12 by 0.4

and finally x=30