Which equation represents "the sum of eight times a number and seven is twice the number"? A. 7N + 8 = 2N

B. 8N + 7 = 2N

C. 8N = 7 + 2N

D. 8(7 + 2N)

Please help Idk math that well! :(((

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.