Just substitue
for
in the expression.



Answer:
A
Step-by-step explanation:
Answer:
John answered 50 questions.
Step-by-step explanation:
Although five of John's answers were incorrect, 90% of his answers were correct.
This means that 5 is 100 - 90% = 10% of the total number of questions, n. So



John answered 50 questions.
Answer:
50
Step-by-step explanation:
70+60 =130
180-130 = 50 degrees
I think it’s b hope it helps