Answer
C. 14
Explanation
The area of triangle = 1/2(base)(height)
The height:
the height is the distance from point (2,-3) perpendicular to the base intersecting it at point (2,1)
the height is then the distance between the 2 points = 4
The base:
the base is the distance between points (7,1)and (0,1) = 7
The area:
the area = 1/2 x 4 x 7 = 28/2 = 14 units²
Unfortunately your teacher is using x as both a variable and a multiplication sign. This is something that can be avoided by using something like the asterisk symbol to indicate multiplication.
Anyways, notice how the expression 
shows up twice. Once in the numerator (the entire numerator) and once again in the denominator (nearly the whole thing)
Let's replace that messy expression with the variable y. So we're letting 
This means,
At this point you can probably see how to get 
from here. The y terms cancel out when we divide leaving 1 up top and 3^x down below.
Answer:
Step-by-step explanation:
<u>Given</u>
- Investment P = $16800
- Interest rate r = 5% = 0.05
- Final amount A = $18900
- Time t = ?
<u>Use the formula</u>
- A = P(1 + rt), where A - final amount, P - investment, r- interest rate, t- time
<u>Substitute the given numbers and solve for t:</u>
- 18900 = 16800( 1 + 0.05t)
- 1 + 0.05t = 18900/16800
- 1 + 0.05t = 1.125
- 0,05t = 0.125
- t = 0.125/0.05
- t = 2.5 years
