Find an equation for the ellipse described.Focus at (-7, 0); vertices at (-8, 0) and (8, 0)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: D
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Solve.
= 8
A. 16 B. -16 C. 10 D. -10
Simplify.
? 
? 
A. 
B. 
C. 
D. 
Find the system of equations to model the problem. DO NOT SOLVE THIS SYSTEM.A $124,000 trust is to be invested in bonds paying 9%, CDs paying 8%, and mortgages paying 10%. The sum of the amount invested in bonds and the amount invested in CDs must equal the mortgage investment. To earn an $11,400 annual income from the investments, how much should the bank invest in each?Let x represent the amount invested in bonds, y the amount invested in CDs, and z the amount invested in mortgages.
A. x + y - z = 0 x + y + z = 124,000 0.09x + 0.08y + 0.1z = 11,400 B. x + y + z = 0 x + y - 9z = 124,000 0.1x + 0.08y - 0.09z = 11,400 C. x + y - z = 11,400 x - y + 9z = 22 8x + y + z = 124,000 D. x + y - z = 0 x + y + z = 124,000 9x + 8y + z = 11,400
Determine if the statement is a proportion.I. 
II. 
A. I is a proportion, II is not a proportion. B. I is not a proportion, II is a proportion. C. I and II are both proportions. D. Neither I nor II are proportions.