For one chemistry test, Joan had to answer 40 questions. Of these 40 questions, joan answered 36 of them correctly. What percent did joan get on her chemistry test?

The answer to your question is 90%

Step-by-step explanation:

Data

total number of questions = 40

total number of questions answered = 36

percent = ?

Process

Let 40 question be the 100% and use proportions and cross multiplication to solve this problem

                     40 questions 100%

                     36 questions  x

                     x = (36 x 100)/40

                    x = 90 %

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.