Solve.
-5x^2+9+7x = 0−5x
2
+9+7x=0

x =, or x=2.21327 and -0.81327

Step-by-step explanation:

see if equation is factor-able:

the two ? must multiply together to and add up to 7x

no two integers times x can solve, so we must use quadratic equation

, given a quadratic

so

-4

step-by-step explanation:

(-4+8)=-(4-8)=-8+4=-4

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.