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antoniya [11.8K]
3 years ago
12

Alex has x dollars per week available for lunch.She spends $3 on lunch every weekday. Write an algebraic expression to represent

how much money she has left over at the end of the week.
Mathematics
1 answer:
MAXImum [283]3 years ago
5 0

Answer:

The money Alex has left over at the end of the week is  ( x - $15).

Step-by-step explanation:

The total lunch allowance of a week = $x

The money spent on lunch every weekday = $3

Number of weekdays in a week = 5 days

Now, the total money spend in 5 weekdays  

=  5 x ( Money spend in 1 weekday)  = 5 ( $3) = $15

So, in  a week she spends $15 in a week.

Total amount Left  = Total Money - Money Spent  =  x - $15

Hence, the money Alex has left over at the end of the week is  ( x - $15).

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The number of minutes that would pass before they were 1870 feet apart is 5.47 minutes

  • Since one student runs at a speed of 180 feet per minutes, in time t minutes, he moves a distance of d = 180t.
  • Also, the second student runs at a speed of 160 feet per minute, in time t minutes, he moves a distance of d' = 160t.

Since they are initially 10 feet apart, their total distance apart after t minutes is D = d + 10 + d'

D = 180t + 10 + 160t

D = 340t + 10

<h3>Number of minutes before they are 1870 feet</h3>

Making t subject of the formula, we have

t = (D - 10)/340

Since they are 1870 feet apart after t minutes, D = 1870 feet.

t = (D - 10)/340

t = (1870 - 10)/340

t = 1860/340

t = 5.47 minutes

So, the number of minutes that would pass before they were 1870 feet apart is 5.47 minutes

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A group of 8 friends went to lunch and spent a total of $76, which included the food bill and a tip of $16. they decided to spli
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Step-by-step explanation:

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