Let $f(x) = x^{10}-8x^8-8x^3+12x^2-5x-5$. without using long division (which would be horribly find the remainder when $f(x)$ is divided by $x^2-1$.

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

Find the solution of system of equation y= x-4 y=4x+2

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how