Please help with explanation

Which function has the smallest y-intercept value

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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