Lightsticks produce light via a chemical reaction. dropping a lightstick into hot water makes it glow a) less intensely. b) more intensely. c) a different color. d) for a longer period of time.

B.) More intensely

Explanation:

If you immerse a lightstick in hot water, the chemical reaction will speed up. The stick will glow much more brightly but will wear out faster too.

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)