What is the vertex of y=-x^2+3x+8

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

What expression is equivalent to log3(x+4)

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