Solve the equation by first multiplying both sides through by an appropriate power of 10 so that the equation contains integers only.0.7x + 0.3 = -0.4
A. -1
B. 0.143
C. -0.1
D. -0.143
Answer: A
Mathematics
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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
Mathematics
Prove the identity.cos x csc x tan x = 1
What will be an ideal response?
Mathematics
Write an equation for the parabola.
A. x2 = -4y B. y2 = -4x C. x2 = 4y D. y2 = 4x
Mathematics
Show that the equation is not an identity by listing the value(s) of the variable from among 0, ?/4, ?/2, and - ?/4 for which the equation is false.sin 2? = 2 sin ?
A. 
and 0
B. 
, 
, and 0
C. 
, 
, and - 
D. 
and - 
Mathematics