The most which number has the same value as 20 tens

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

The triangle shown has a hypotenuse with a length of 13 feet. the measure of angle a is 20 degrees. and the measure of angle b is 70 degrees. which of the following is closest to the length, in feet, of line segment ac? no need to use a calculator to find the trig numbers. each function is listed below. 4.4 5 12.2 35.7

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation.