The relationship between the cost, y, in dollars, of x pounds of concrete can be modeled by a proportional equation.

Part A: 1.20 is y=20 is x

Part B= 9$

Step-by-step explanation:

Part A: if we notice our chart we will see that 4.80=80 so what we could do is say 1.20$ equals 20 pounds of concrete (you can do this differently for example 0.60$=10 pounds of concrete, but I just chose 20.)  

Part B: If we want to find how much 150 pounds of concrete is we will first add 20 pounds 3 times giving us 140 pounds and then we split 20 and get 10, which equals 150, then we have to do the same thing for the cost, so 4.80+3.60=8.40 and then we split 1.20 in half giving us 0.60 which we then add to get 9$.

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.

step-by-step explanation: