Answer:
Step-by-step explanation:
the diameter is the measurement that is all the way across the circle which is given to you so the diameter is 7cm. To find the radius it is half the way across the circle so it is half the diameter so in this case the radius would be 3.5cm
Answer:
This does represent an exponential function , because his savings increase by a constant rate
Step-by-step explanation:
Let
x -----> the number of weeks
y ----> the amount saved
In this problem we have a exponential function of the form

where
a is the initial value
b is the base
r is the rate of change
where

---- because he doubles the amount each week
----> 
substitute

therefore
This does represent an exponential function , because his savings increase by a constant rate
(4 ) given 4(3x + 2) - 2 ( distribute the bracket by the 4 )
= 12x + 8 - 2 = 12x + 6
given 20b - 16
20 and 16 have a common factor of 4 which can be taken out
= 4( 5b - 4 ) ← in factored form