868 is about 870, and 28 is about 30, so your expression would be 870 divided by 30 which would be 29 and the actual answer is 31, so your estimate would be close to your actual answer.
Nothing times itself will equal 29, but in decimal form only is 5.38
Your answer is5x^4 * sqrt 3x
$207 is the answer, multiply 25 x 36 and 22 x 51 and 3 x 5, then subtract the products from the first two multiplications and then subtract 15 and you get your answer.
Answer is false. the slope is 1 because x equals one. the one is hidden but it is next to x
