Answer:
I think its 120°. I don't 100% know, but that's my guess.
A coefficient is the number before any variables, which usually is a letter. <span>Variables that have no numbers have a coefficient of 1.</span>
a. 2 and 100
b. 1 and 4
c. 4 and 2
Answer:less than
Step-by-step explanation:
-15+3-7=-19
-9-1+16=6
A positive will always be bigger than a negative
Let Jean's speed while running = x mph
Then Jean's speed while riding will be = x+9 mph
Distance covered by running = 8 miles
Distance covered by riding = 11 miles
Total time taken to complete the race = 1.5 hours
As, 
So, time for running= 
And time for riding= 
Equation becomes:

Now, multiply every term by 2x(x+9) to clear denominators:

Simplifying it we get

Solve the quadratic equation using formula

putting a=3 , b= -11, c= -144
we get (x - 9)(3x + 16) = 0
where x=9 and x=
Neglect the negative answer as speed cannot be negative, so x = 9 mph
Hence, Jean's running speed is 9 mph and riding speed is x+9 = 9+9 = 18 mph