Add or subtract as indicated.-20 + 11 - 13 - (-7)
A. -29
B. -3
C. -25
D. -15
Answer: D
Mathematics
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Provide an appropriate response.Solve the following using a system of equations: The sum of two numbers is 21. If the larger is 3 more than the smaller, find each number.
Fill in the blank(s) with the appropriate word(s).
Mathematics
Translate the phrase to an algebraic expression. Use "x" to represent "a number". The sum of a number and 
A. 
B. x + 
C. 
? x
D. x - 
Mathematics
Write the quotient in the standard form.
A. -i B. i C. 1 D. -1
Mathematics
Solve triangle, if possible. Round angles an side lengths to the nearest tenth when necessary. 
A. a ? 8.3, B ? 6.9°, C ? 143.1° B. a ? 8.3, B ? 2.8°, C ? 147.2° C. a ? 7.3, B ? 7.8°, C ? 37.8° D. a ? 7.3, B ? 7.8°, C ? 142.2°
Mathematics