What is the percentage increase of R11, 50 to R12​

Solve the equation 3x2 + 19x + 9 = 0 to the nearest tenth.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

The height of a plant, in inches, p years after planting it is given by the polynomial function r(p) = -2p% + 270p. find the height of the plant when p = 90 years.