Perform the indicated operation. Write the result in the form a + bi.(2 - 9i)(6 + 9i)
A. 93 + 36i
B. -81i2 - 36i + 12
C. -69 - 72i
D. 93 - 36i
Answer: D
Mathematics
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Use scientific notation to perform the following operations. Leave your answer in scientific notation.(5 × 109) - (3 × 108)
A. 4.7 × 109 B. 4.7 × 108 C. 2 × 109 D. 2 × 101
Mathematics
Provide an appropriate response.Solve the system of equations using the substitution method:3x + 4y = 172x - 5y = 19
A. (2, -3) B. (7, -1) C. dependent; many solutions D. inconsistent; no solution
Mathematics
Provide an appropriate response. Use the tangent function to find a of a standard right triangle ABC given b = 243 ft and B = 78.2°. Round to four significant digits.
A. 1,163 ft B. 49.69 ft C. 1,188 ft D. 50.77 ft
Mathematics
Add.90.44292 + 390 + 8.071 + 60.64 + 6.6476
A. 555.80152 B. 555.90152 C. 556.80152 D. 555.81152
Mathematics