A person's score on a Mad Minute is proportional to the amount of questions he or she answers correctly. Each Mad Minute lasts the same amount of time. On her first test, Rachel earned a score of 70 when she answered 25 questions correctly. Rachel says this relationship can be modeled with an equation.

s = 2.8y

Step-by-step explanation:

Score is proportional to the amount of correctly answered question :

Given that:

Score earned by Rachael = s =70

Number of correctly answered question = y = 25

Hence,

Score α number of correctly answered question

s = ky

70 = 25k

k = 70/25

k = 2.8

Hence, one correct answer gives 2.8

Hence,

Score obtained = 2.8 * number of questions answered correctly

s = 2.8y

14

step-by-step explanation:

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b