Answer:
(a)
radius=diameter/2
=21/2=10.5m
(b)
radius=diameter/2
=3.25/2=1.625mm
I would appreciate if my answer is chosen as a brainliest answer
Answer:

Step-by-step explanation:
Given

Required
Determine the roots
To get the root of the function, then f(b) must be 0;
i.e. f(b) = 0
So, the expression becomes

Add 75 to both sides


Take square roots of both sides


Reorder

Expand 75 as a product of 25 and 3

Split the expression




The options are not clear enough; however the roots of the equation are 
Answer:
10.5 miles
Step-by-step explanation:
You multiply the distance with the number of times he ran.
Answer:
12.5%
Step-by-step explanation:
There is only 1 seven card from the 8 total cards.
1 out of 8.
1/8 = 0.125
P(7) = 12.5%
Answer:
x = 140
Step-by-step explanation:
180 - 65 - 75= 40
180 - 40 = x
140 = x