solve the formula for the specific variable A=1/2bh for h

Question

1. solve the formula for the specific variable A=1/2bh for h

 

2. Walt made an extra $7,000 last year from part time job. He invested part of the money at 9% and the rest 6%. He made a total of $510.00 in interest. how much was invested at 6%

 

Answer 1

Hi Vivian,

 

1. Answer to the first question: h = 2A/b (rather trivial)

 

2. Answer to a second question could be found by solving the equation for x (money invested at 6%):

 

x*0.06 + (7,000-x)*0.09 = 510

0.03*x=120
x=$4,000

 

The amount of money invested at 6% is $4,000

 

Best regards,