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# Help. ​

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Help.

Sep 26, 2017

#1
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Note that if we have   "t"   number of shirts and they cost \$30 each.....the total cost of these shirts  is just  cost of each shirt  * number of shirts  = 30t......and 2.75 represents what is known as the "fixed cost"....we must pay this cost no matter how many shirts that we order....so......the total cost of ordering "t"  shirts is just     30t + 2.75

Now...to find the cost of ordering 5 shirts......just sub  "5"  in for "t"  and evaluate.....I'll leave this to you, NSS....send me back your reply

For the second one....this is just a proportion

306 / 8.5   =    M / 9.1    where M is the number of miles that we're trying to find

Cross- multiply

9.1 * 306   =  8.5M      divide both sides by 8.5

9.1 * 306 / 8.5  = M       ....and I'll leave it to you to  find this....

Sep 26, 2017
#2
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They're both answer choices C??

NotSoSmart  Sep 26, 2017
#3
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The second one is "C"......you have the correct numerical answer for the first.....but look at the function that you have chosen, 2.75t + 30.....are we paying 2.75 for each shirt????....or ....are we paying \$30 for each shirt????

Note  if we used  2.75 (5) + 30   we would only get  \$43.75

Sep 26, 2017
#4
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it equaled 152.75

NotSoSmart  Sep 26, 2017
#5
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Isn't the correct answer for the second one,   "D".....????

30t + 2.75

30 (5) + 2.75   =     152.75

Sep 26, 2017
#6
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Oh!! my mistake, I thought I put D and C for the choices.. that's why i was confused

NotSoSmart  Sep 26, 2017
#7
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Sorry....I meant the correct choice for the first one

The answers should be  D  and C

Sep 26, 2017
edited by CPhill  Sep 26, 2017