If
, then
and
because
lies in the fourth quadrant.
By DeMoivre's theorem,

so the answer is B.
B because 18 isn’t much bigger than 15. I guessed so I am more than likely wrong
Knowing that a year later, the car is only worth 0.80 x, you can simplify that by stating that one year after purchase, the car is only worth 80% of its original purchase price.
Another way of stating that is that the car lost 20% of its value of the course of one year.
The charges for mowing lawns are $5 per hour and charges for walking dogs are $3 per hour.
Step-by-step explanation:
Let,
x be the charge per hour for mowing lawns
y be the charge per hour for walking dogs
According to given statement;
10x+4y=62 Eqn 1
8x+5y=55 Eqn 2
Multiplying Eqn 1 by 5

Multiplying Eqn 2 by 4

Subtracting Eqn 4 from Eqn 3

Dividing both sides by 18

Putting in Eqn 1

Dividing both sides by 4

The charges for mowing lawns are $5 per hour and charges for walking dogs are $3 per hour.
Keywords: linear equation, subtraction
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