Find the axis of symmetry of the graph y=ax2 +bx +c when b=0

On a piece of paper graph f(x)=5•(0.4)^x

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)

Carmen begins her next painting on a rectangular canvas that is 82.7 cm long and has a area of 8,137.68 cm2. will the painting fit in a frame with an opening that is 82.7 cm long and 95 cm wide? explain