Find the center and the radius of the sphere that has the given equation.
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Mathematics
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Write a formula for the nth term of the arithmetic sequence. Use the formula to find the indicated term of the sequence.a = 6, d = -2;
Find a16.
A. an = 8 - 2n, a16 = -12 B. an = 6 - 2n, a16 = -24 C. an = 8 - 2n, a16 = -24 D. an = 8 + 2n, a16 = -24
Mathematics
Find the exact value of the expression.sin 
A. 
B. 
C. 
D. 
Mathematics
Factor the four-term polynomial by grouping.20a3 + 12a2b - 25ab2 - 15b3
A. (4a2 - 5b2)(5a + 3b) B. (20a2 - 5b2)(a + 3b) C. (4a2 + 5b2)(5a - 3b) D. (4a2 - 5b)(5a + 3b)
Mathematics
Find the sum.2.521 + 11.241 + 202.79
A. 216.552 B. 216.442 C. 216.452 D. 216.542
Mathematics