Decrease £40 by 10% someone me! x

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

Tanyss's house has 25 windows. her brother has washed 22 of the windows. what percent of the windows has her brother washed?

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.