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VashaNatasha [74]
3 years ago
9

Please help me with this questions

Mathematics
1 answer:
zalisa [80]3 years ago
4 0
He messed up step 2 he added instead of multiplying
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(3-5i)(2+9i)+(7+2i)(7-2i)
kondor19780726 [428]
i^{2} = -1

-----------------------------------------

(3-5i)(2+9i)+(7+2i)(7-2i) = \\  \\  =  6 + 27i - 10i - 45i^{2} + 49 - 14i + 14i - 4i^{2} =  \\  \\  =55 + 17i + 45 + 4   = \boxed{104 + 17i}
7 0
3 years ago
Solve the inequality 0<5x-2<8
zloy xaker [14]

Answer:

×= 2 this is what I got as a result to my equations

8 0
3 years ago
Read 2 more answers
Plz help it’s important
m_a_m_a [10]

Answer:

  • hemisphere volume: 262 m³
  • cylinder volume: 942 m³
  • composite figure volume: 1204 m³

Step-by-step explanation:

A. The formula for the volume of a hemisphere is ...

  V = (2/3)πr³

For a radius of 5 m, the volume is ...

  V = (2/3)π(5 m)³ = 250π/3 m³ ≈ 261.799 m³

__

B. The formula for the volume of a cylinder is ...

  V = πr²h

For a radius of 5 m and a height of 12 m, the volume is ...

  V = π(5 m)²(12 m) = 300π m³ ≈ 942.478 m³

__

C. Then the total volume is ...

  V = hemisphere volume + cylinder volume

  V = 261.799 m³ +942.478 m³ = 1204.277 m³

__

Rounded to the nearest integer, the volumes are ...

  • hemisphere volume: 262 m³
  • cylinder volume: 942 m³
  • composite figure volume: 1204 m³

_____

As a rule, you only want to round the final answers. Here, the numbers are such that rounding the intermediate values still gives the correct final answer. That is not always the case.

6 0
3 years ago
Look at the graph shown below:
sleet_krkn [62]

Answer:

the answer is C

the y intercept is +3

if you do rise over run, the slope will be 1/2

3 0
3 years ago
Why can't a trapezoid have 4 obtuse angles
In-s [12.5K]
Hello there, and thank you for posting your question here on brainly.

A trapezoid is not possible to have for obtuse because it would look more like a diamond. Also, if it had 4 obtuse angles, it would have 6 sides.

Hope this helped!! ☺♥
7 0
3 years ago
Read 2 more answers
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