Find f(-4) please help

f(-4)=11

Step-by-step explanation:

f(-4) means you plug in -4 where it can be plugged in. Since you have a piecewise function, find where x can be -4, and you'll see it's the first one because that equation works when x<3, which -4 is smaller than 3

Plug in -4, and that's your answer

f(x)=x^2-5

f(-4)=(-4)^2-5

f(-4)=16-5

11

We can represent the total number of people who live in the city with the variable 'p'

20% is 0.2 in decimal form, so 20% of the people who live in the city can be represented as 0.2p.

Since 20% of people in city bought pizza, and 4500 people bought pizza, we can form an equation:

0.2p = 4500

Multiply both sides by 10 in order to get rid of the decimal (It's not necessary, but sure does make the calculation less confusing!):

0.2p * 10 = 4500 * 10

2p = 45000

p = 22500

22,500 people lived in the city.