Solve the system of equations by substitution. x + y = 02x + 3y = -7
A. (-7, 7)
B. (7, -7)
C. (-6, 6)
D. (6, -6)
Answer: B
Mathematics
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Show that the set has cardinal number ?0 by establishing a one-to-one correspondence between the natural numbers and the given set. Be sure to indicate the general correspondence.{1, 5, 9, 13, 17, ...}
A.
| 1, | 2, | 3, | 4, 5, ..., n, ... |
| ? | ? | ? | ? | ? ? |
B.
| 1, | 2, | 3, | 4, 5, ..., n, ... |
| ? | ? | ? | ? | ? ? |
C.
| 1, | 2, | 3, | 4, 5, ..., n, ... |
| ? | ? | ? | ? | ? ? |
D.
| 1, | 2, | 3, | 4, 5, ..., n, ... |
| ? | ? | ? | ? | ? ? |
Mathematics
A particle moves with position function r(t) = (21t-7t³-5)i+21t²j.
 multiple choice.png)
Mathematics
Decide whether or not the set is closed under addition.{0, 1}
A. Closed B. Not closed
Mathematics
Change the given quantity to the indicated unit. Round the answer to the nearest tenth of the unit if necessary.4 oz ? g
A. 140.8 g B. 18.2 g C. 112.0 g D. 1816.0 g
Mathematics