Answer:
y = 20 
Step-by-step explanation:
Use the points to find the values of a and b
Using (0, 20 ) , then
20 = a
[
= 1 ] , then
20 = a
y = 20
Using (3, 1280 ) , then
1280 = 20 b³ ( divide both sides by 20 )
64 = b³ ( take the cube root of both sides )
= b , that is
4 = b
Then exponential function is
y = 20. 
-(3*8)+6=-18
the water level decreased by 18 inches.
Answer:
base = 
Step-by-step explanation:
An isosceles triangle has 2 sides of equal length (a) and base (b)
⇒ perimeter of an isosceles = 2a + b
Given:




Therefore, base = 