Answer:
u = (b/hn)
Step-by-step explanation:
The inverse!!
14 = 7*2
63 = 7*9
14 7 * 2 2 2
---- = ------- 7/7 =1, so = 1 * ------ = ----
63 7 * 9 9 9
Answer:
Step-by-step explanation:
The formula of simple interest is:
Where I is the interest earned after t years
r is the interest rate
is the initial amount
We know that the investment was $20,000 in two accounts
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<u><em>For the first account</em></u> r = 0.07 per year.
Then the formula is:
Where
is the initial amount in account 1 at a rate 
during t = 1 year
<u><em>For the second account </em></u>r = 0.05 per year.
Then the formula is:
Where
is the initial amount in account 2 at a rate 
during t = 1 year
Then
We know that the final profit was I $1,280.
So
Substituting the values 
, 
and I we have:
As the total amount that was invested was $20,000 then
Then we multiply the second equation by -0.07 and add it to the first equation:
Then 
IF -2/5 + -1/4 IS IN PARENTHESES:
skip this part if its not
(1/2) / (-2/5 - 1/4)
(-2/5 - 1/4) is equivalent to (-8/20 - 5/20) = -13/20
substitute -13/20 for (-2/5 - 1/4)
1/2 / -13/20
remember that division is the inverse of multiplication, so if we flip the second fraction, we can change the division sign to multiplication (when doing this, never flip the first fraction, you will not get the right answer)
1/2 * -20/13
simplify -20/2 to get -10
1 * -10/13 = <u>-10/13</u>
IF -2/5 + -1/4 IS NOT IN PARENTHESES:
1/2 / -2/5 +-1/4
PEMDAS : multiplication/division comes before addition / subtraction
1/2 / -2/5 = (apply the flip rule : read the chunk of text above if you don't know what it is) 1/2 * -5/2 = -5/4
subtract 1/4 form -5/4 now
-5/4 - 1/4 = -6/4
simplify
= <u>-3/2</u>
I used a guess and check method to solve this equation.
I multiplied 18 by 1,2,3,4,5,6
I multiplied 9 by 1,2,3,4,5,6
After that I added the two products together to find the answer.
I then figured out that at 6 hours they will meet up
<em>6 hours.</em>
