# Math Help - questions

1. ## questions

1. Jill is investing $500 at 5% compounded annually. Jess is investing$400 at 6% compounded annually. When will their investments be equal?

2. when light passes through ice, the light's intensity is reduced by 4% for every centimetre of the ice's thickness.

a) Determine an algebraic model where T is the ice's thickness and I is the intensity of light.

2. Using $A=P(1+\frac{r}{n})^{nt}$

n=1 for both

$500(\frac{21}{20})^{t}=400(\frac{53}{50})^{t}$

Can you solve for t?.