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Elena-2011 [213]
2 years ago
11

Helpppppp meeeeeeeeee

Mathematics
2 answers:
zhenek [66]2 years ago
7 0
1.5 not that hard but hope it helps
Law Incorporation [45]2 years ago
3 0

Answer:

The temperature needs to rise <u>1.5</u> degree C to reach 0 degree C.

Step-by-step explanation:

-1.5+<u>1.5</u>=0

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Calculate the slant height for the given square pyramid. Round to the nearest tenth.
spayn [35]

the answer would have to be 7.8


7 0
3 years ago
Weekand homework and i need help
Lelechka [254]

Answer:

C. 54

Step-by-step explanation:

36/60=.6

90*.6=54

8 0
2 years ago
Read 2 more answers
Let $a$ and $b$ be nonzero real numbers such that
algol [13]
<h3>Answer:   -7/2</h3>

=========================================================

Explanation:

Let's expand out (2 - 7i)(a + bi) using the FOIL rule

(2 - 7i)(a + bi) = 2a + 2bi - 7ai - 7bi^2

(2 - 7i)(a + bi) = 2a + 2bi - 7ai - 7b(-1)

(2 - 7i)(a + bi) = 2a + 2bi - 7ai + 7b

(2 - 7i)(a + bi) = (2a+7b) + (2bi-7ai)

(2 - 7i)(a + bi) = (2a+7b) + (2b-7a)i

We're told the result is purely imaginary. What this means is that the real part (2a+7b) is zero, while the imaginary part (2b-7a) is nonzero. If both are zero, then we have 0+0i = 0 which is purely real.

For example, the complex numbers 0-7i and 0+2i are purely imaginary.

Let's use the fact that 2a+7b must be zero to do the following steps:

2a+7b = 0

2a = -7b

a = -7b/2

a/b = -7/2 which is the final answer

We must check to see if 2b-7a is nonzero

2b - 7a = 2b - 7(-7b/2)

2b - 7a = 2b + 24.5b

2b - 7a = 26.5b

The result is nonzero if and only if b is nonzero. Luckily we're told b is nonzero at the top of the problem. So we don't have any worries that (2b-7a) is zero.

Therefore, (2a+7b) + (2b-7a)i will be purely imaginary with a/b = -7/2

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

A concrete example:

Let a = -14 and b = 4

a/b = -14/4 = -7/2

(2-7i)(a+bi) = (2-7i)(-14+4i) = 0 + 106i which is purely imaginary.

I'll let you do the steps in expanding that out using the FOIL rule.

4 0
1 year ago
Please just answer with a picture
PIT_PIT [208]
From the instructions i gather it might be like this

8 0
3 years ago
The regular price of a sweater is $ 42.99. It is on sale for 29% off. Find the sale price?
Feliz [49]
The sale price is $30.52
:)

3 0
3 years ago
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