Formula: a=bh/2
if b=50 and h=20, then a=?
can someone explain how to solve this?

Hundred and tens tables to make 430 in five different ways

Is of - 4x + 2? a. 3 b. 4 c. 6 d. 5

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.