A hot air balloon rises 9 meters every 3 seconds. How high does the hot air balloon rise in 15 seconds?

45 meters

Step-by-step explanation:

so if i divided 9  by 3 it's 3 meters per sec then i times 15 by 3 equals 45

b. 2

step-by-step explanation:

the slope of a line =δy/δx

δy= y₂-y₁

δx= x₂-x₁

therefore, using the points (-2,-3)   and (3,7) we can calculate gradient as follows:

m=(7--3)/(3--2) (a number minus a negative number the sign changes to a plus)

m=(7+10)/(3+2)

=10/5

=2

b

step-by-step explanation: