Astrong cold front blew through during the night. the temperature outside began to drop rapidly. the graph below shows the temperature at each hour after the cold front blew through.

what is the rate of change in the graph?
a.
2.5°f per hour
b.
-2.5°f per hour
c.
-0.2°f per hour
d.
0.2°f per hour

B -2.5 per hour

Step-by-step explanation:

you can tell this will be negative because the temperature is dropping, by looking at the graph i see in two hours the temp. drops 5 degrees, if you divide this by 2 (to see the amount dropped per hour) you get 2.5 but remember this is negative therefore the rate of change is -2.5

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.