Which method should be used to solve the system? Explain your answer, including a description of the first step.-3x2 + y2 =9-8x2 + 9y2 =25
What will be an ideal response?
Either method may be used. Elimination may be used since the equations have the same types of terms (x2, y2, constant). If elimination is used, then the first equation should be multiplied by 9 or -9. Substitution may be used efficiently, since a coefficient of the first equation has an absolute value of 1. If substitution is used, then the first equation should be solved for y2.
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Find an equation for the sphere with the given center and radius.Center (-9, 4, 0), radius = 6
A. x2 + y2 + z2 - 18x + 8y = -61 B. x2 + y2 + z2 + 18x + 8y = -61 C. x2 + y2 + z2 - 18x - 8y = -61 D. x2 + y2 + z2 + 18x - 8y = -61
Determine the order of integration and then evaluate the integral.
A. 
(e81 - 1)
B. 
(e81 - 1)
C. 
e81
D. 
e81
Which of the following three-step processes has been found to be most effective when teaching sampling distributions with Sampling Sim software?
a. predict-test-evaluate b. show-tell-practice c. simulate-analyze-simulate d. software-manipulatives-address learning styles
Solve the problem.The table shows an area's population (in millions) every 10 years from 1975 to 2015. What was the difference in population from 1985 to 2015? 
A. 1.416 million B. 4.956 million C. 3.54 million D. 41.064 million