2. round to the nearest tens place and then estimate the sum.
262 + 523
a 785
b 780
c 790
d 800

To round to the nearest tens place, look at he value of t he ones. If the ones is a 5 or higher you round the tens value up, if the ones is under 5, the tens value stays the same.

262, the ones is a 2, so the tens stays the same = 260

523, the ones is a 3, so the tens stays the same = 520

Now add: 260 + 520 = 780

The answer is B. 780

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,