Which value of b would make x²+bx-30 factorable?
A. -31
B. -17
C. 11
D. 13

D. 13

Step-by-step explanation:

well since it's a quadratic equation, it can be written in the form of ax²+bx+c=0. So we have a=1, b=b and c= -30. Also the roots are given by the equation-

x= -b± /2a. So all I did was put the number from the choices which would satisfy the sqrt part and that turned out to be 13 since = = 17. So b=13.

answer: the first one

step-by-step explanation: use a calculator and divide the minutes by the dollars.

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.