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Elina [12.6K]
3 years ago
12

What is 7.8×105 hours in days?

Mathematics
1 answer:
gayaneshka [121]3 years ago
3 0

Answer:

3.250 x 10^4

Step-by-step explanation:

7.8 x 105 ÷ 24 = 32500

then do the whole turning it into standard form by taking it to one whole number and the rest being the decimals

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What is y equal to ?
Oksana_A [137]
To find the answer for this question you need to first understand that 3 angles of a triangle make up 180 degrees. To make a triangle you want to cut the shape down from the 82 degrees to the degrees X. You then will be left with angle Y, a 90 degree angle, and the angle cut in half (which would be 41). You add 41 to 90 to get 131, and subtract that from 180 to get 49 degrees as your angle Y. Hope this helped <3
7 0
3 years ago
A glasshouse is in the shape of a square pyramid. Calculate the area of the four triangle faces to be nearest square metre if th
Eduardwww [97]

Answer:

  789 m²

Step-by-step explanation:

Consider the cross section created by a vertical plane through the apex of the pyramid and bisecting opposite sides. The cross section is an isosceles triangle with base 20 m and height 17 m. One side of this triangle is the slant height of the face of the pyramid.

The side of the triangle above can be found using the Pythagorean theorem. A median from the apex of the triangle will divide it into two right triangles, each with a base of 10 m and a height of 17 m. Then the hypotenuse is ...

  s² = (10 m)² +(17 m)² = 389 m²

  s = √389 m ≈ 19.723 m . . . . . slant height of one triangular face

__

The area of one triangular face is ...

  A = (1/2)sb

where s is the slant height above, and b is the 20 m base of the face of the pyramid. There are 4 of these faces, so the total area is ...

  total lateral area = 4A = 4(1/2)sb = 2sb = 2(19.723 m)(20 m)

  total lateral area ≈ 789 m²

7 0
3 years ago
Use completing the square to solve for x in the equation (x-12)(x+4)= 9.
iragen [17]

Answer:

x = 4 + sqrt(73) or x = 4 - sqrt(73)

Step-by-step explanation by completing the square:

Solve for x:

(x - 12) (x + 4) = 9

Expand out terms of the left hand side:

x^2 - 8 x - 48 = 9

Add 48 to both sides:

x^2 - 8 x = 57

Add 16 to both sides:

x^2 - 8 x + 16 = 73

Write the left hand side as a square:

(x - 4)^2 = 73

Take the square root of both sides:

x - 4 = sqrt(73) or x - 4 = -sqrt(73)

Add 4 to both sides:

x = 4 + sqrt(73) or x - 4 = -sqrt(73)

Add 4 to both sides:

Answer:  x = 4 + sqrt(73) or x = 4 - sqrt(73)

4 0
4 years ago
Bart is going to paint his bedroom. His uncle told him that a gallon of paint would cover a surface of approximately 40 square f
maw [93]

Answer:

The measurement for the length of the walls.

Step-by-step explanation:

Given

Cost = \$22 per gallon

Height = 9ft

1\ gallon = 40ft^2

See comment for complete question

Required

The additional information needed to solve the question

First, we need to calculate the area of the walls of the bedroom.

The height of the ceilings represents the length/width of the walls; so, we need the width of each side of the bedroom.

Since the width is not given, then we can conclude that the additional information needed is the length/width of the walls.

6 0
3 years ago
7(n-6) power of 2 -x
Alexus [3.1K]

Answer:

         7(n - 6)

(2 - x)      

Step-by-step explanation:

2 - x is the base and 7(n - 6) the exponent.

The desired expression is:

         7(n - 6)

(2 - x)                  

or

(2 - x) ^ (7(n - 6))

4 0
3 years ago
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