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Aleks [24]
3 years ago
8

I need help with questions 2-5

Mathematics
1 answer:
Daniel [21]3 years ago
4 0

Answer: X^2-x-1=y

Step-by-step explanation:

Multiply every number inside the parentheses

(X+3)(x-4)

X^2-4x+3x-1

Add all similar numbers and we get

X^2-X-1

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The surface area of this regular pyramid is 1040 cm2. The base is a regular pentagon with side b = 16 cm and slant height l =15
Valentin [98]

Answer:

(a) = 11 cm

Step-by-step explanation:

The formula for finding the surface area of a regular pyramid is B + (1/2*P*l), with B being the area of the base, p being the perimeter of the base, and l being the slant of the pyramid.

The area of a pentagon can be solved using the formula 1/2*a*p, with a being the apothem and p being the perimeter of the pentagon.

  1. B + (1/2*80*15) = 1040
  2. B + 600 = 1040
  3. 1040 - 600 = 440 (440 is the area of pentagon)
  4. 1/2*a*(16*5) = 440
  5. 40*a = 440
  6. 440/40 = 11

The apothem is 11 cm. Hope this helps!

6 0
3 years ago
Simplify 150 -(0.4 x 150)+15
Rufina [12.5K]
150-(0.4 x 150)+15= 105
5 0
3 years ago
A drawer contains 12 brown socks, 8 white socks, and 2 blue socks. One sock is selected at random.
Katyanochek1 [597]

Answer:

1/11

Step-by-step explanation:

12 + 8 + 2

22 / 2

1/11

There is always a pair of socks... A pair is 2. Add everything and divide it.

Hope this helps....

3 0
3 years ago
Read 2 more answers
What is 96 multiplied by 72​
Wewaii [24]

Question: What is 96 multiplied by 72​.

Answer:6912

Steps:Multiple 96 x 72.

3 0
3 years ago
Where common multiples between three and five and one and 50
Arlecino [84]
300 is a multiple of 3,5,1, and 50
5 0
3 years ago
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