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Igoryamba
3 years ago
10

PLEASE PLEASE HELP ME !!!

Mathematics
1 answer:
Veronika [31]3 years ago
5 0

Answer:

i7 jsisisheh grrrddfff

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PLEASE HELP ME!
algol13

Step-by-step explanation:

1.\sum_{i=1}^{5}3i

The simplest method is "brute force".  Calculate each term and add them up.

∑ = 3(1) + 3(2) + 3(3) + 3(4) + 3(5)

∑ = 3 + 6 + 9 + 12 + 15

∑ = 45

2.\sum_{k=1}^{4}(2k)^{2}

∑ = (2×1)² + (2×2)² + (2×3)² + (2×4)²

∑ = 4 + 16 + 36 + 64

∑ = 120

3.\sum_{k=3}^{6}(2k-10)

∑ = (2×3−10) + (2×4−10) + (2×5−10) + (2×6−10)

∑ = -4 + -2 + 0 + 2

∑ = -4

4. 1 + 1/4 + 1/16 + 1/64 + 1/256

This is a geometric sequence where the first term is 1 and the common ratio is 1/4.  The nth term is:

a = 1 (1/4)ⁿ⁻¹

So the series is:

\sum_{j=1}^{7}(\frac{1}{4})^{j-1}

5. -5 + -1 + 3 + 7 + 11

This is an arithmetic sequence where the first term is -5 and the common difference is 4.  The nth term is:

a = -5 + 4(n−1)

a = -5 + 4n − 4

a = 4n − 9

So the series is:

\sum_{j=1}^{5}(4j-9)

5 0
3 years ago
What is the difference between the absolute value of 4 and the absolute value of –3?
Sergeeva-Olga [200]
1.
the absolute value of (-3) is 3
4 - 3
1
8 0
3 years ago
Read 2 more answers
Find the volume of a cylinder if it is 2 feet tall and has a diameter of 1.5. Use 3.14 for pi.
olga55 [171]

Answer:

3.5325

Step-by-step explanation:

V = 3.14*(.75^2)(2)

You divide the diameter by 2 to get the radius which is 1.5/2 =.75

r=.75

h=2

and you use the equation for volume of cylinder which is V = pi x radius squared x height

5 0
2 years ago
Read 2 more answers
Bill manages a restaurant. He schedules most of his employees to work on saturdays and fridays at night. If 24 of the 40 employe
Julli [10]

Answer:

40%

Step-by-step explanation:

40-24=16

16/40 ×100 =40%

8 0
3 years ago
Do 3/7 and 7/3 represent the same length on a number line?
Anna [14]
No 3/7 do not represents the same length on the number line
5 0
3 years ago
Read 2 more answers
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