Can someone help me solve
(5x^2+3x+4)-(2x^2+5x-1)

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank