Pls help dont understand any of this

Questions 3

X+100+130=360

X+230=360

X=360-230

X=130

Step-by-step explanation:

a+b+c=180

50+50+50=180

150=180

a+b+c=180-150

=30

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,

d. 8

step-by-step explanation:

the given radical expression is:

we can rewrite this as:

we express as square numbers to get;

the exponents will now cancel out to give.

the correct answer is d