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Liula [17]
2 years ago
15

Given Sn=2n^2 - 5n, find

Mathematics
1 answer:
brilliants [131]2 years ago
6 0

Answer:

a) -3

b) 117

c) 100

Step-by-step explanation:

(a) 2(1)²-5(1)

1²= 1

2×1= 2

2-5= -3

(b) 2(9)²-5(9)

9²= 81

81×2= 162

162-45= 117

(c) 2(4)²-5(4) +2(8)²-5(4)

4²=16

16×2= 32

32-20= 12

8²=64

64×2= 128

128-40= 88

88+12= 100

hope it helps!

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She was at 40 feet below, she swam up getting so she was then at 40-10 = 30 feet below sea level.

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The answer is 34 feet below sea level (-34)

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What is the answer to the equation: 8+10
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Answer:

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Multiply or divide the following measurements. Be sure each answer you enter contains the correct number of significant digits.
nydimaria [60]

Answer:

93.4 g/mL x 20. mL = 1868g.

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Step-by-step explanation:

Let's analyze each case.

93.4 g/mL x 20. mL

Hewe we are multiplying g/ml*ml. So we have the answer is (g*ml/ml) = g.

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216.3 m/66.4 s

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We are dividing a measurement in m by a measurement in s. So the answer is in m/s.

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6 0
3 years ago
I need help with this question please.​
MakcuM [25]

Answer:

30 degrees.

Step-by-step explanation:

Rotational symmetry is defined as a figure having the same appearance when rotated by a certain angle.

The wheel has 12 "handles." We can use these as reference points when rotating the image.

We also know that we can rotate by a total of 360 degrees. We can say that:

360/12 = 30 degrees.

Each time you rotate the wheel by 30 degrees, the image will end up on another handle (looks the same). This shows rotational symmetry.

I hope this helps!

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3 years ago
Please need answer help help?!?!?
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Answer:

5

Step-by-step explanation:

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