3(x + 5) = 7x - 13 3x + 15 = 7x - 13
- 3x -3x
1557x - 13
+13 +13
28 = 7x
7 7
4=x
x=4
What is the first step of this algebraic proof after the given?
Addition
Subtraction
Division
Multiplication
ОО
Distributive

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.