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Dafna1 [17]
4 years ago
15

Kelly went to a store to purchase a coffee pot. She will use a coupon for 20% off. She can calculate the cost before sales tax u

sing the follow expression, c represents the original cost of the coffee pot. C- 0.2c
Which other expression could kelly use to calculate her cost before sales tax?
A. 0.8c
B. 1.2c
C. 1.8c
D. 80c
Mathematics
1 answer:
alexgriva [62]4 years ago
7 0

Answer:b

Step-by-step explanation:

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I tried solving it but I everytime I follow how its suppose to go, I dont get the right answer.
77julia77 [94]

Answer:

B. 64.9

Step-by-step explanation:

A graphing calculator or spreadsheet can fit these points with an exponential curve. An appropriate answer for x=14 is about 73.3.

_____

<em>Comment on the answer choices</em>

The closest answer that makes any sense is 64.9. Often these problems are worked by someone who uses inappropriate rounding of intermediate results. I haven't found the magic set of numbers to get 64.9. About the lowest I can get is 66.7, using 0.0037·e^(0.7x).

8 0
3 years ago
What is 22/9 as a mixed number
sergiy2304 [10]
If you do 22÷9 and see the hole number: 2. Then do 2 x 9 and you get 18. Now do 22-18 and you get 4. So do 2 4/9. Always have the denominator stay the same.
5 0
4 years ago
Read 2 more answers
In the diagram below, the perimeter of the triangle is equal to the perimeter of the square. What is the length of a side of the
kondaur [170]

The perimeter of each is the sum of the lengths of its sides.

Triangle Perimeter = 16 + 4x-3 +3x = 7x+13

Square Perimeter = 2x +2x +2x +2x = 8x

If these are equal, you have

7x+13=8x\\\\13=x\qquad \mbox{subtract 7x}\\\\26=2x\qquad \mbox{multiply by 2}

The length of a side of the square is 26 units.

3 0
3 years ago
A bag of marbles can be divided evenly among 2, 3 or 4 friends.
aivan3 [116]

Answer:

a)12 b)12 c)36

Step-by-step explanation:

a)find the least common multiple. the number of marbles is that number * n (where n is an integer)

b) the least common multiple. it is 4*3=...

c)12*3 =?

then just divide by 2,3,4 to get the answer

8 0
3 years ago
F(x)=x+3 ;find f (x+1)
nataly862011 [7]

Answer:

x+4

Step-by-step explanation:

(x+1)+3

8 0
3 years ago
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