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dexar [7]
3 years ago
15

What is 30 % of 50 answer fast Please

Mathematics
2 answers:
o-na [289]3 years ago
6 0
Alright my friend so 30% of 50 will be 15
klemol [59]3 years ago
3 0
Answer is 15. 39% of 100 is 30% so just divide that in half.
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What are the types of roots of the equation below? x^4 - 81 = 0
blsea [12.9K]
Your answer is B, two complex roots and two real roots.

By factoring the original equation(which is a difference of two squares), you get:
x^{4}-81=0\\(x^{2}-9)(x^{2}+9)=0

Because first root is also a difference of two squares, it factors into x - 3 and x +3, your two real roots.
When you factor the second root, the roots are x - 3i and x + 3i.

To prove this, let's multiply them back together:
[(x-3)(x+3)][(x-3i)(x+3i)]=0\\\\(x^{2}+3x-3x-9)(x^{2}+3xi-3xi-9i^{2})=0\\\\(x^{2}+0x-9)(x^{2}+0xi-9(-1))=0\\\\(x^{2}-9)(x^{2}+9)=0\\\\x^{4}+9x^{2}-9x^{2}-81=0\\\\x^{4}-81=0

We reached the equation we started with, so that means that the roots are:
x + 3,
x - 3,
x + 3i, and
x - 3i,
two of which are real and two are complex.
7 0
3 years ago
Please help me with the online work !!!!!!!!!!!!!! acellus
Viktor [21]

Answer:

240 cm², A = 300 cm², and 540 cm²

Step-by-step explanation:

1) The area of a parallelogram is A = bh, so:

A = (20)(12)

A = 240 cm²

2) Similarly, the area of a rectangle is A = bh, so:

A = (15)(20)

A = 300 cm²

3) The composite area is the sum of both the rectangle's area and the parallelogram's area, so:

240 cm² + A = 300 cm² = 540 cm²

3 0
3 years ago
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Emilio borrows $1200 from a bank with 7.5% simple interest per year. How much will he have to pay back total in 4 years?
seropon [69]

Answer:

1560

Step-by-step explanation:

1200*0.075 = 90

1200+90+90+90+90

4 0
3 years ago
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Darya [45]

Answer:

Ten Million!

Step-by-step explanation:

sorry bahahaha i didnt realize what you were asking for.

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3 years ago
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The cafeteria director at Great Minds School wants to know what percent of the students would choose vegetarian entrees if they
Korvikt [17]

Answer:

Sort a list of the students into a random order, then ask the first 353535 students on the list.

Step-by-step explanation:

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