Solve.The sum of the squares of the digits of a positive two-digit number is 20, and the tens digit is 2 more than the units digit. Find the number.
A. 24
B. 53
C. 42
D. 35
Answer: C
Mathematics
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Solve the problem.Find the mass of the solid in the first octant between the spheres 
and 
if the density at any point is inversely proportional to its distance from the origin.
A. 15k?
B. 
k?
C. 
k?
D. 90k?
Mathematics
Write in logarithmic form.43 = 64
A. log43 = 64 B. log364 = 4 C. log464 = 3 D. log644 = 3
Mathematics
Use the product rule to simplify the radical.
A. 10
B. 70
C. 22
D. 7
Mathematics
Solve the inequality and graph the solution set.| r + 6 | > 4
A. -10 < r < -2 ; (-10, -2)
B. No solution
C. r > -2 ; (-2, ?)
D. r < -10 or r > -2 ; (-?, -10) ? (-2, ?)
Mathematics