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enyata [817]
3 years ago
8

Sandy sold half of her comic books and then brought 6 more.She now has 11.How many did she begin with?

Mathematics
2 answers:
andreyandreev [35.5K]3 years ago
8 0
10. 11 - 6 = 5 x 2 = 10 :)
grigory [225]3 years ago
7 0
10 books is the answer
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A variable needs to be eliminated to solve the system of equations below. Choose the
sasho [114]

Step-by-step explanation:

-4x - 2y = 18

+ (4x - 4y = -36)

=> -6y = -18, y = 3

As we added the equations together, we have eliminated x and found y.

Hence the correct answer is "Add to eliminate x".

4 0
2 years ago
The mean of three numbers is 70. if two of the numbers are 55 and 65 what is the third number
Margarita [4]
90
55+65=120
there are 3 numbers and when you divide them it makes 70.
70 x 3 = 210
210 - 120 = 90
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210 / 3 = 70
6 0
3 years ago
Read 2 more answers
Place in ascending order:<br> --8, -20, -v1
natima [27]

Answer:

-20, -8, -v1

Step-by-step explanation:

Descending order: -8, -20, -v1

Ascending: -20, -8, -v1

Hope this helps!

5 0
3 years ago
he campus of a college has plans to construct a rectangular parking lot on land bordered on one side by a highway. There are 720
marusya05 [52]

Answer:

  (a) 720 -2x

  (b) 0 ≤ x ≤ 360

  (c) A = x(720 -2x)

  (d) (30.334, 68.645) ∪ (291.355, 329.666) (two disjoint intervals)

  (e) x = 180 ft, the other side = 360 ft; total area 64,800 ft²

Step-by-step explanation:

(a) The two parallel sides of the fenced area are each x feet, so the remaining amount of fence available for the third side is (720 -2x) ft. Then ...

  length = 720 -2x

__

(b) The two parallel sides cannot be negative, and they cannot exceed half the length of the fence available, so ...

  0 ≤ x ≤ 360

__

(c) Area is the product of the length (720-2x) and the width (x). The desired function is ...

  A = x(720 -2x)

__

(d) For an area of 20,000 ft², the values of x will be ...

  20000 = x(720 -2x)

  2x² -720x +20000 = 0

  x = (-(-720) ±√((-720)² -4(2)(20000)))/(2(2)) = (720±√358400)/4

  x = 180 ±40√14 = {30.334, 329.666} . . . feet

For an area of 40,000 ft², the values of x will be ...

  x = 180 ±20√31 ≈ {68.645, 291.355} . . . feet

The values of x producing areas between 20,000 and 40,000 ft² will be values of x in the intervals (30.334, 68.645) or (291.355, 329.666) feet.

__

(e) The vertex of the area function is at the axis of symmetry: x = 180. The corresponding dimensions are ...

  180 ft × 360 ft

and the area of that is 64,800 ft².

8 0
3 years ago
Simplify this (0.001)^3. ​
Yuliya22 [10]

Answer:

0.003  

Step-by-step explanation:

4 0
3 years ago
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