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zzz [600]
3 years ago
14

1. Subtract (7 – 19i) from (–6 + 12i). A. –13 – 31i B. –13 + 31i C. 13 – 31i D. 13 + 31i

Mathematics
2 answers:
Evgesh-ka [11]3 years ago
8 0

Answer:

C. 13 – 31i

Step-by-step explanation:

(7 – 19i) from (–6 + 12i)

That means

-6 +12i -  (7 – 19i)

Distribute the minus sign

-6 +12i -  7 + 19i

-6-7 +12i +19i

-13 +31i

pav-90 [236]3 years ago
6 0

Answer:

Step-by-step explanation:

(-6+12i)-(7-19i)=

-6+12i-7+19i=

-13+31i

(b)

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The sum of two numbers a and b is 7 and the difference between them is 2. What is the value of a x b ? Give your answer as a mix
Andre45 [30]

Answer:

45/4

Step-by-step explanation:

We can interpret the question to have two equation which can be solve simultaneously

a+b=7------------(1)

a-b=2------------(2)

From eqn(2) make a subject of formula

a=2+b--------(3)

Substitute the (3) into eqn(1)

a+b=7------------(1)

2+b+b=7

2b=7-2

2b=5

b=5/2

From equation (3) substitute value of b to find a

a=2+b--------(3)

a= 2+5/2

a=9/2

Then What is the value of a x b ?

9/2× 5/2

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8 0
2 years ago
50 POINTS IF YOU ANSWER CORRECTLY please I need help:)
Zinaida [17]

Answer:

60 degree

Step-by-step explanation:

They are complementary angles which means they must add up to 90.

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90-30=60.

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8 0
3 years ago
Read 2 more answers
A 2012 Gallup poll surveyed Americans about their employment status and whether or not they have diabetes. The survey results in
posledela

A) See picture for the table.

To make the table, multiply 47774 by 1.5% to get total that have diabetes and multiply 5855 by 2.5% to get total unemployed that have it, then using subtraction fill in the other squares of the table.

B)

Hypothesis:

H0: No association between employment and diabetes.

H1: Association between the two

Using a graphing calculator or Excel, run a chi-test.

Chi squared equals 31.844 with 1 degrees of freedom.

 The two-tailed P value is less than 0.0001

With this information we can reject the null hypothesis and conclude there is an association between diabetes and employment.

C)

Although there is a statistical significance, there really is no practical significance between an incidence rate of 1.5 or 2.5%

3 0
3 years ago
2. The restaurant bill you and your friend received was not itemized. You ordered 2 drink refills and the egg breakfast, for a t
PilotLPTM [1.2K]
3r+b=9.35
-
2r+b=8.40

r=0.95
7 0
3 years ago
What is the value of this expression<br> 8 + 6x (10 - 4) +2
Vinvika [58]

Answer:

8+6x(10-4)+2\\= 10 - 4\\= 6 + 2\\= 8 * (8 + 6x)\\ = 8 + 6x\\= 14x * 6\\= 84x\\

Step-by-step explanation:

hope this helps.

4 0
2 years ago
Read 2 more answers
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