What is the x and y intercept of f (x) = -x^2 + 25

Plz which expression is equivalent to the expression below?

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.