Solve each system of equations using matrices (row operations). If the system has no solution, say that it is inconsistent.x - y + 2z + w = 2y + z = 2z - w = 3
A. {(-5 - 4w, -1 - w, 3 + w, w)}
B. {(-5, -1, 3, w)}
C. ?
D. {(-9, -2, 4, 1)}
Answer: A
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A. ?All of its faces are congruent polygons. B. ?n-vertices are formed with (n + 1) - faces. C. ?Often called an Archimedean Solid. D. ?All of its faces are congruent regular polygons and n-vertices are formed with n-faces. E. ?a and c are true.
Use identities to simplify the expression.
- 
A. sec x B. tan2 x sec x C. csc x D. sec x tan x
Answer the question.True or False.Every whole number is a real number.
Answer the following statement true (T) or false (F)
Solve the problem. Use a calculator with an LN or a LOG key.In chemistry, the pH of a substance is defined by 
where 
is the hydrogen ion concentration in moles per liter. Find the 
of a sample of lake water whose 
is 3.05 × 10-9 moles per liter. (Round to the nearest tenth.)
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