Thread: algebra question

I need help with this problem, I'm unsure as whether to distribute the h or not.

Solve for "a"

D=1/5h(a-b)

As well as this...

An actor invests some money at 7%, and 47,000 more than four times the amount at 12% The total annual interest earned from the investment is 49640. How much did he invest in each amount?
He invested ___ at 7% and ___ at 12%

Originally Posted by Deathscyth3

I need help with this problem, I'm unsure as whether to distribute the h or not.

Solve for "a"

D=1/5h(a-b)

Is your equation...

Form 1:

or

Form 2: ?

Originally Posted by Air

Is your equation...

Form 1:

or

Form 2: ?

or

Form 3: ?

Originally Posted by Air

Is your equation...

Form 1:

or

Form 2: ?

It is like the first one except H is not part of the 1/5, it is 1/5 (space) h(a-b)

Its form 3.

Multiply both sides by :



Open the bracket on the right hand side:



Add to both sides:



Divide both sides by :

done.

Originally Posted by Deathscyth3

As well as this...

An actor invests some money at 7%, and 47,000 more than four times that amount at 12% The total annual interest earned from the investment is 49640. How much did he invest in each amount?
He invested ___ at 7% and ___ at 12%

Let x = amount invested at 7%.
.07x = interest accumulated

Let 4x + 47000 = amount invested at 12%
.12(4x + 47000) = interest accumulated

Total interest accumulated is given by:

.07(x)+.12(4x+47000) = 49640

Can you finish?