Call the 1% account X
After 3 years the interest it earned is X times 1% for 3 years
=X(.01)(3)
=0.03X
The 2.5% account has (1000 - X) dollars
It earns (1000-X(.025)(3)
=(1000 - X)(.075)
=75-.075X
The total of the interest is 55
Therefore .03X + 75 -.075X = 55
- .045X = 55 - 75
-.045X = -20
.045X = 20
45X =20000
X = 20000 / 45
X = $ 444.44
Therefore the amount invested id the 2.5% account is
1000 - 444.44
=$ 555.56
The length is: 42 inches
The width is : 21 inches
f(x) = 2x - 3, for f(x) = 13
13 = 2x - 3
Add 3 to both sides.
16 = 2x
Divide both sides by 2
8 = x
