1-4 I need help, I need equations and explanations

Which of the following is true for the relation f(x)=2x^2+1

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

Which fraction is equal to 1hole and 2/5? a.3/5 b.75 c.57 d.73