Ions are atoms or groups of atoms with positive or negative electrical charges. The charges of some ions are given. Use these values to find the total charge. 
13 borate and 9 hydroxide
A. +30
B. -40
C. -30
D. -48
Answer: D
Mathematics
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Rewrite as an equivalent logarithmic equation. Do not solve.yz = 3
A. z = log y 3 B. y = log 9 z C. z = log 9 y D. y = log z 3
Mathematics
Find the annual amount of depreciation using the straight-line method. Round to the nearest dollar.Cost:$350Estimated life:3 yearsEstimated scrap value:$70
A. $117 B. $70 C. $93 D. $23
Mathematics
Simplify.
A. m B. -m - 5 C. -m D. m + 5
Mathematics
Solve the formula for the indicated variable.L = 
for k
A. k = 
B. k = 
C. k = 
D. k = 2WL2
Mathematics