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mixer [17]
3 years ago
6

Rate of change of y = –4.5x + 15

Mathematics
1 answer:
Minchanka [31]3 years ago
3 0
The rate of change would be -4.5, because no matter what the line is changing at a rate of -4.5
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Jimmy has listed the amount of money in his wallet for each of the last ten days. He decides to remove day 7, as that was payday
abruzzese [7]

Answer:

The mean will reduce

Step-by-step explanation:

The total amount of money for the ten days divided by number of days will give mean 1, M₁

Removing the value for day seven will reduce the sum of money as it will be for 9 days only.In finding the mean, you will divide by 9 days to get mean M₂

Mean M₂ < M₁

8 0
3 years ago
Members of a college chemistry department agree to contribute equal amounts of money to make up a scholarship fund of $280. Then
Zarrin [17]

Answer:

7 members

Step-by-step explanation:

Lets say that the department has n members. If each member contributes with an equal amount x and make a total of $280, we know that:

n*x = 280

Where each one colaborated with:

n*x/n = 280/n

Or what is the same that: (as the n on the left eliminate themselves)

x = 280/n (*)

Now the department hires 3 more members, so we now have n+3 members. And we know that the pass from contributing x to contribute $30 less, it is, x-30 (I omit the $ symbol for simplicity). So, know we have:

x-30 = 280/(n+3)

We can replace x here by the formulation of x we did in the (*) equation:

( 280/n) - 30 = 280/(n+3)

using common denominator:

( 280/n) - 30 n/n = 280/(n+3)

( 280 - 30 n)/n = 280/(n+3)

Cross multiplying the denominators:

( 280 - 30 n)*(n+3) = 280*(n)

280n - 30n^2 + 840 - 90n = 280n

Subtracting 280 n in both sides:

30n^2 + 840 - 90n = 0

Dividing both sides by 30:

-n^2 - 3n + 28 = 0

Factorizing this term (you can notice the factor immediately or solving with baskara resolution, I omit the baskara for simplicity):

-(n + 7)(n - 4) =0

So, n is equal to 4 and -7. As we are dealing with people we can not have -7 people, so we keep only n=4.

So, previous the new hiring there were 4 members, now there are 7.

The used to collaborate with 280/4 = $70, now the collaborate with 280/7=$40, and we see the collaboration decreased in $30.

7 0
3 years ago
What are the measures of x y and z
Svetlanka [38]
Hahah what you learning...............
7 0
3 years ago
Express 2.7 as a fraction of 3.6 giving your ansver as a fraction<br> in its lowest terms.
MakcuM [25]
2.7 is 27/10 and 3.6 is 18/5
3 0
2 years ago
Tatiana had $350. she spent $180 on herself, and the rest on presents for her family. write an equation to express how much tati
alisha [4.7K]
For the answer to the question above asking to <span>write an equation to express how much tatiana spent on her family if </span><span>Tatiana had $350. she spent $180 on herself, and the rest on presents for her family. t</span>he answer would be 350-180
8 0
2 years ago
Read 2 more answers
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