What is the result of subtracting the second equation from the first? \begin{aligned} 2x+7y & = -8 2x-5y & = -1 \end{aligned} 2x+7y 2x−5y =−8 =−1

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

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)

Which statement is true about a number and its additive inverse? a. their product is always one. b. their sum is always one. c. they are always reciprocals of each other. d. their sum is always zero.