Heather has made 28 note cards for her friends. She plans to send out a total of forty cards. What percentage of the cards has she finished?

Multiply. −2x(6x4−7x2+x−5) express the answer in standard form. enter your answer in the box.

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 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)