Multiply the whole number with the denominator and then add the numerator . The final answer goes on top and your denominator stays the same
STEPS:
1. Using your straightedge, draw a reference line, if one is not provided.
2. Copy the side of the square onto the reference line, starting at a point labeled A'.
3. Construct a perpendicular at point B' to the line through ab2.
4. Place your compass point at B', and copy the side of the square onto the perpendicular b'g. Label the end of the segment copy as point C.
5. With your compass still set at a span representing AB, place the compass point at C and swing an arc to the left.
6. Holding this same span, place the compass point at A' and swing an arc intersecting with the previous arc. Label the point of intersection as D.
7. Connect points A' to D, D to C, and C to B' to form a square.
Answer:
The dispensing unit worth today: $21,000
Step-by-step explanation:
If we assume that a year has elapsed since the dispensing unit was purchased, then we know that it has lost 25% of its initial value.
If its initial value was 28,000 then we calculate 25% of 28,000

Now we subtract 7000 from the initial amount to get the current value.
The current value is:

(-4,-2)
You just plug in the numbers from the ordered pair, into your equation. Remember, the formula for ordered pairs are (x,y). :)