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soldier1979 [14.2K]
3 years ago
7

Show that 7c3 +7c2=8c4​

Mathematics
1 answer:
andrezito [222]3 years ago
8 0
Well it’s easy do it yourself 17
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(5a^2+6a+2)-(7a^2-7a-5)
krok68 [10]

For this case we must simplify the following expression:(5a^ 2 + 6a + 2) - (7a^ 2-7a-5) =

We eliminate the parentheses taking into account that:

- * + = -\\- * - = +

So:

5a ^ 2 + 6a + 2-7a ^ 2 + 7a + 5 =

We add similar terms taking into account that:

Equal signs are added and the same sign is placed.

Different signs are subtracted and the major sign is placed.

5a ^ 2-7a^2 + 6a + 7a +2 +5 =\\-2a ^ 2 + 13a + 7

Answer:

-2a ^ 2 + 13a + 7

8 0
3 years ago
Which table shows a decreasing linear relationship?
Andrej [43]
Table C since it is decreasing at a constant rate of 5.
55 - 5 = 50
50 - 5 = 45
45 - 5 = 40
5 0
3 years ago
An Equilateral Triangle has sides that all measure 10 inches. What is
densk [106]

Answer:

easy peasy lemon squeasy

Step-by-step explanation:

1. base of triangle: it is an equilateral triangle, so any side of the triangle you take is the base, (usually the largest side of the triangle is the base)

so that would be => 10 inches,

2. a property of an equilateral triangle is that , the median of the triangle coincides with the height of the triangle,

therefore, the height bisects the base and makes a right triangle with another side, therefore by using the Pythagoras theorem, we find it to be 8.66(approx)

now,

area of the triangle would be (putting the values we just found in the formula given)

=> [(10)(8.66)]/ 2

=>43.3 square inches

4 0
3 years ago
What is the area of the shaded triangle?
weeeeeb [17]
The area is 30 m!


A= 30m
6 0
3 years ago
The length of a rectangle is 16 inches. if the width is 25% of its length, what is the perimeter of the rectangle​
Leokris [45]

Answer:

Perimeter = 40 inches

Step-by-step explanation:

Length = 16 inches

Width = 25% of length (16)

          = 25% of 16

25% = 1/4

Width = 1/4 x 16

          = 4 inches

Length = 16 inches

Width = 4 inches

Perimeter of a rectangle = length + length + width + width:

                                         = 16 + 16 + 4 + 4

                                         = 32 + 8

                                         = 40

PERIMETER = 40 inches

So glad I could help :)

4 0
3 years ago
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