Question 1150624: dave needs to make at least $950 this week to buy the TV he has been wanting. He makes $36 for every security device he sells but he has $175 in travel cost.
write an inequality that represents Daves pay (p) for the week by selling (x) number of security devices.
what is the least number of security devices that dave will need to sell to buy the TV.
if he sells 31 devices how much short will he be from his goal of $950?
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! x = number of security devices he needs to sell.
the profit equation is:
p = 36 * x - 175.
since p has to be greater than or equal to 950, then you get:
36 * x - 175 >= 950.
start with 36 * x - 175 >= 950
add 175 to both sides of the equation to get:
36 * x >= 950 + 175
combine like terms to get:
36 * x >= 1125
divide both sides of this inequality by 36 to get
x >= 1125/36
solve for x to get:
x >= 31.25
if he sells 31 security devices, he'll make 36 * 31 - 175 = 941 dollars.
if he sells 32 security devices, he'll make 36 * 32 = 977 dollars.
he needs to sell at least 32 devices to make more than 950 dollars.
if he only sells 31 devices, he will make 941 dollars and be short of his goal of 950 dollars by 9 dollars.
that's your solution.
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