Answer:
(-1)^2 = +1
Step-by-step explanation:
(-1)(-1) is equivalent to (-1)^2, and vice versa. Recall that when two negative numbers are mult. together, the product is positive. Thus, (-1)^2 = +1.
Rocco and Guilia can paint and finish together in 3 hours while Rocco alone can do it alone in 7 hours. Guilia at the rate of 1/r can finish the job expressed in the following equation. 1/3= 1/7+1/r. Getting r, r is equal to 5.25 hrs. Hence, Guilia can do painitng alone in 5.25 hrs.
Answer Expert Verified
If a vertical line is drawn then the line will cut at only one point. In first graph for all x values we have different y values so the ordered pairs represent a function.