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Anestetic [448]
4 years ago
12

Find ∑(5 – 2k) when k goes from 2 to 7

Mathematics
1 answer:
mash [69]4 years ago
8 0
Easiest way:
5-4=1
5-6=-1
5-8=-3
5-10=-5
5-12=-7
5-14=-9

Add these up:

30-54=-24
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Anyone that can help me with this please?Not soo good at math.​
kakasveta [241]

As it is right angled , we can use pythagoras theorem.

Using the therorem :

(x+2)² + (4x+4)² = (5x)²

x² + 4x + 4 + 16x² + 32x + 16 = 25x²

25x² - 17x² - 36x - 20 = 0

8x² - 36x - 20 = 0

2x² - 9x - 5 = 0

2x² -10x + x - 5 =0

2x(x-5) + 1(x-5) =0

(x-5)(2x+1) = 0

x = 5 or x = -1/2

x cannot be -1/2 as it would make hypotenuse negative.

So x = 5

Sides are 7 m, 24 m , 25 m

The area = 1/2 × base × height

Area = 1/2 × 24 × 7 = 84 m²

5 0
3 years ago
Read 2 more answers
Complete the work to simplify the expression (-2d^5)^4
klio [65]

Answer:

16d^20

Step-by-step explanation:

to raise a product to a power, raise each factor to that power. (-2)^4x(d^5)^4

evaluate the power (-2)^4 x (d^5)^4

                                   16 x (d^5)^4

3 0
3 years ago
Read 2 more answers
13/20 , 11/15 , 5/8, 7/12 from least to greatest
Sveta_85 [38]

Answer:

Least 2 Greatest:

7/12,   5/8,  13/20,  11/15

Step-by-step explanation:

Googled it

Plz say thxs and rate me!

Yours Truly.

5 0
3 years ago
Here are the 30 best lifetime baseball batting averages of all time, arranged in
Harrizon [31]

Answer:

Is there any more letters

Step-by-step explanation:

8 0
3 years ago
Square root of 69x420
kirza4 [7]

69 • 420 = 28,980

√29980 = 173.15

5 0
3 years ago
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