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Alla [95]
2 years ago
11

Please help will give braineist

Mathematics
1 answer:
Harlamova29_29 [7]2 years ago
6 0

Answer:

  1. 9 easy

Step-by-step explanation:

go ahead easiest thing ever lol

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Evaluate 6²-7²+8²-9²+..+998²-999²​
Llana [10]

Answer:

-499,485.

Step-by-step explanation:

We can transform this to an arithmetic series by  working it out in pairs:

6^2 - 7^2 = (6-7)(6+7) = -13

8^2 - 9^2 = (8-9)*8+9) = -17  

10^2 - 11^2 = -1 * 21 = -21 and so on

The common difference is -4.

The number of terms in this series  is (998 - 6) / 2 + 1

= 992/2 + 1 = 497.

Sum of n terms of an A.S:

= n/2 [2a1 + (n - 1)d  

Here a1 = -13, n = 497, d = -4:

Sum = (497/2)[-26 - 4(497-1)]

= 497/2 * -2010

= -499,485.

3 0
3 years ago
V I’mhjhvcbjvcvjhvvvggujvvcghhhvcccgggghh
Solnce55 [7]

Answer:

the like terms were not grouped together.

4 0
3 years ago
56 projects 5:9 ratio divide
Alex Ar [27]
The answer is 4:4 it takes 4 of each





4 0
2 years ago
The length of Rectangle A is 20 inches and the width is 4 inches. The length of Rectangle B is
astraxan [27]

Answer:

8 inches

Step-by-step explanation:

Let w be the width of rectangle B.

Since, both rectangles are similar.

Therefore, corresponding lengths and widths of rectangles A and B will be in proportion.

\therefore \frac{20}{40}  =  \frac{4}{w}  \\  \\  \frac{1}{2}  =  \frac{4}{w}  \\  \\ w = 2 \times 4 \\  \\ w = 8 \: inches

5 0
3 years ago
Read 2 more answers
Solve for x, y and z. Round your answers to the nearest tenth.
Viktor [21]

Answer:

Step-by-step explanation:

6 0
2 years ago
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