Ions are atoms or groups of atoms with positive or negative electrical charges. The charges of some ions are given. Use this information to find the total charge. 
12 hydroxide ions
A. +24
B. -24
C. -12
D. +12
Answer: C
Mathematics
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Simplify.Evaluate. 5-4
A. -625
B. 
C. 625
D. 
Mathematics
Solve the system.x2 + y2 = 36x2 - y2 = 36
A. {(6, 0), (-6, 0)} B. {(6, 0)} C. {(0, -6)} D. {(0, 6), (0, -6)}
Mathematics
Find the 10th term in the binomial expansion.
?
?
Please enter your answer as a fraction.
What will be an ideal response?
Mathematics
Solve the problem.A person puts $30 into a bank account on January 1, $40 on February 1, $50 on March 1, and so forth. How much has the person put into the bank account by December 30?
A. $1080 B. $2040 C. $1020 D. $840
Mathematics