What is the simplified form of the expression 7[63÷(5^2-2^2)-1]?

a. 10
b. 42
c. 14
d. 350

which is a solution of the equation y=4x+3?

a. (5,17)
b. (17,5)
c. (4,19)
d. (4,16)

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.