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.

y=mx+b

step-by-step explanation:

m slope, b y-intercept

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870