Sophia took a test with 21 questions. If she answered two sevenths of the questions correctly, how many did she get wrong?

Sophia took a test with 21 questions.

If she answered two sevenths of the questions correctly, number of correct answers she did: N = 21 x 2/7 = 6

=> Number of answers she got wrong: N = 21 - 6 = 15

Hope this helps!

:)

She wronged 15 questions.

Step-by-step explanation:

Given that she answer 2/7 correctly. So firstly, you have to calculate how many questions she answered correctly, you have to multiply it by 21 :

She has answered 6 questions correctly then the remaining questions are wrong. So you have to substract from the correct answer :

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.