What plus what equal  56

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

Given that abcd is a rhombus, what is the value of x?

Tom drove 206 miles in 3.9 hours. estimate his average speed.