$2200 at 7.5% for 3 1/4 year what is the interest rate

$536.25

Step-by-step explanation:

First you find what 7.5% of $2200 is,

(2200/100)7.5=165

Then, you multiply 165 by 3 1/4 to find how much interest is accumulated over 3.25 years

165)3.25=536.25

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.