Double check my answer ?

after plotting the data where x represents the length of the side of a polygon, and f(x) represents the area of the polygon, jack used technology and constructed an appropriate model to approximate the area of the polygon. use the model jack created to predict the area of a polygon that has a side length of 3.
f(x) = x^2 + 3x + 1.

answers:
1. 10
2. 18
3. 19
4. 20

my answer = 18

correct?

Two rigid transformations are used to map abc to qrs. the first is a translation of vertex b to vertex r. what is the second transformation? a reflection across the line containing ab a rotation about point b a reflection across the line containing cb a rotation about point c

Amanager recorded the number of bicycles sold by his company each quarter. his projected sales after t years is given by the expression below. which of the following statements best describes the expression? a. the initial sales of 575 bicycles increases at the rate of 4% over 4 quarters. b. the initial sales of 575 bicycles increases at the rate of 18% over 4 years. c. the initial sales of 575 bicycles increases at the rate of 4% over t quarters. d. the initial sales of 575 bicycles increases at the rate of 18% over t years.

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.