Laurie is trying to stay within 10 feet of her current diving depth of negative 30 feet (with regard to sea level) so that the light is still good but she can be close to the sea life during her scuba dive. Which two equations can be used to find the minimum and maximum depths Laurie wants to stay between?
Answer
A
negative 30 minus x is equal to 10 and negative 30 minus x is equal to negative 10
B
x minus 10 is equal to 30 and x minus 10 is equal to negative 30
C
x plus 10 is equal to 30 and x plus 10 is equal to negative 30
D
negative 30 plus x is equal to 10 and negative 30 plus x is equal to negative 10
Explanation
A depth within 10 feet of −30 feet is 10 feet above or below −30, so the boundary depths are −20 feet and −40 feet. The equations −30 − x = 10 and −30 − x = −10 give those two values for x. Choice A lists those equations.
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