Use the indicated row operation to change the matrix.Replace R2 by R1 + R2.
A. 
B. 
C. 
D. 
Answer: A
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Find the equation for the plane tangent to the parametrized surface S at the point P.S is the cylinder r(?, z) = 2 cos ?i + 2 sin ?j + zk ; P is the point corresponding to 
.
Fill in the blank(s) with the appropriate word(s).
Solve the problem.On August 13, the Bryer family received 23 pieces of mail, consisting of magazines, bills, letters, and ads. If they received the same number of magazines as letters, three more bills than letters, and five more ads than bills, how many magazines did they receive?
A. 3 magazines B. 6 magazines C. 4 magazines D. 11 magazines
Solve the problem.Mara can type 1120 words in 
hour (40 minutes). How many words per minute can she type?
A. 28 words/minute B. 19 words/minute C. 42 words/minute D. 747 words/minute
Solve the linear equation with the intersection-of-graphs method. Approximate the solution to the nearest hundredth if necessary.
(1 + 2.4x) = 2.4(x + 4.22)
A. 11.39 B. 4.54 C. 10.05 D. 5.14