A student needs to collect exactly 20 insects for a science project. The student has already collected 13 insects. Write an equation that can be used to find n, the number of insects the student still needs.
A. 13n = 20
B. n - 13 = 20
C. n + 13 = 20
D. 20 + 13 = n

Which of the following questions is a statistical question? (2 points) how many professional sport leagues are there? where do the professional sport leagues play? how many hours of professional training took place over the weekend? how many hours do you spend each week training for a sports league?

Ammonia molecules have three hydrogen atoms and one nitrogen atom. how many of each atom arein five molecules of ammonia

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.