Consider the case of a bank offering r (given as a decimal) interest per year compounded monthly, if you deposit $p.
a. what is the interest rate per month?
b. write a formula for the amount a you have after nn months.
c. write a formula for the number of months it takes to have a dollars.
d. what is the doubling-time of an investment earning 7% interest per year, compounded monthly? round up to
the next month.

Given: ab ≅ cd and ad ≅ bc prove: abcd is a parallelogram. statements reasons 1. ab ≅ cd; ad ≅ bc 1. given 2. ac ≅ ac 2. reflexive property 3. △adc ≅ △cba 3. ? 4. ∠dac ≅ ∠bca; ∠acd ≅ ∠cab 4. cpctc 5. ∠dac and ∠bca are alt. int. ∠s; ∠acd and ∠cab are alt. int. ∠s 5. definition of alternate interior angles 6. ab ∥ cd; ad ∥ bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3? triangle angle sum theorem sas congruency theorem sss congruency theorem cpctc