Answer:
416
Step-by-step explanation:
Length = 2(width)
perimeter = 36 cm
using variables where x = width and y = length
Perimeter = 2x + 2y = 36 cm
y = 2x
solving for length 2x + 2(2x) = 36 cm
2x + 4x = 36 cm
6x = 36 cm
x = 6 cm
so y = 2(6 cm) = 12 cm
area of rectangle = 12 cm * 6 cm = 72 cm^2
Answer:
Area of rectangle=9×17=153 SQ.ft
Area of semi-circle=π9'2/2
Area of traingle=(1/2)×7×9=31.5
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
_______________________________________________
<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 
Answer:
1. Equation: 
2. Total pay if Henry sells 27 copies:
Step-by-step explanation:
1. The equation of the line in Slope-Intercept form is:

Where "m" is the slope and "b" is the y-intercept.
According to the information given in the exercise, his base salary is $2,100. So you can identify that:

Since he makes an additional of $90 for every copy of he sells, you can identify that:

Therefore, the equation that represents this situation is:

2. If he sells 27 copies, then:

Substituting this value into the equation, you get that his total pay would be:
