Add or subtract.
- 
A. 
B. 5
C. 
D. 
Answer: D
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An x-ray of a patient's leg is done with a current setting of 30mA for a time of 1s. If none of the distances is changed and the current is increased to 60mA, what should the exposure time be?
A. 2s B. 4s C. 0.5s D. 0.25s
The following expressions represent denominators of rational expressions. Find their LCD.x2 + 6x + 5 and 2x + 10
A. 2(x - 1)(x - 5) B. 2(x + 1)(x - 5) C. 2(x - 1)(x + 5) D. 2(x + 1)(x + 5)
Use words such as linear, quadratic, cubic, polynomial, degree, one variable, and two variables to describe the expression.8x4 - 8x4y - 9
A. not a polynomial B. 5th - degree polynomial in two variables C. 4th - degree polynomial in two variables D. 5th - degree polynomial in one variable
Solve the problem.The orbit of a planet around a sun is an ellipse with the sun at one focus. The aphelion of a planet is its greatest distance from the sun, its perihelion is its shortest distance, and its mean distance is the length of the semimajor axis of the elliptical orbit. If a planet has a perihelion of 397.4 million miles and a mean distance of 399 million miles, write an equation for the orbit of the planet around the sun.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1