-5 +- sq rt of 21/2
Quadratic formula
A= 1 b= 5 c= 1
-b +- sq rt b^2-4ac /2a
-5 +- sq rt 25-4(1)(1) /2
2.5 hours and you’re welcome
Answer:

Step-by-step explanation:
In this problem we have a exponential equation of the form

where
y is the population of the city
x is the number of years
a is the initial value or y-intercept
b is the base
r is the rate of growth
b=(1+r)
we have

substitute

For x=17 years
substitute the value of x in the exponential equation and solve for y


0.6n = n + 31.8
0.6n - n = 31.8
-0.4n = 31.8
n = 31.8 / -0.4
n = -79.5
Answer:
5x² - 20x
Step-by-step explanation:
multiply each term in the parenthesis by the 5x outside
5x(x - 4)
= (5x × x ) + (5x × - 4 )
= 5x² + (- 20x) = 5x² - 20x