Each cheerleading uniform includes a shirt and a skirt. Shirts cost $12 each, and skirts cost $18 each. The expression 12u+ 18u represents the cost in dollars of buying u uniforms. Simplify the expression by combining like terms.

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.