Which expressions are quadratic expressions? Check all that apply. z2
2x + 7x – 10
2x2 + 9x - 7
500(0.25)-1
13x3 + 21x2 - 5

PLEASE HELP IM ON A TIMER

John makes $10.50 pers hour what expression represens how much he will make if he works h hours

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =