To do this problem, you need to find how many questions per minute she can do. You would need to do 21 divided by 14. Which equals 1.5 questions per minute. From there you would do 1.5 times 30 and get 45.
So she can get 45 questions in 30 minutes.
Hope that helps!!
1013 , just had this question mark brainliest answer please!!!

//Add 6 to both sides:

//Multiply by -1 on both sides:

Multiply by 3 on both sides:

Divide by 4 on both sides:

-----------------------------------------
Answer: x = 15 (Answer C)-----------------------------------------
I would say B. The mean is a good measure of central tendency.
I hope this helps!
Answer:
a=20
Step-by-step explanation:
7+13=20
20-7=13