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baherus [9]
2 years ago
11

Help, please! Struggling!

Mathematics
1 answer:
MArishka [77]2 years ago
6 0

Answer:

65

Step-by-step explanation:

(4-7i)(4+7i) =16 + 28i-28i -49i^2 ➡16 - 49i^2

16 + 49 = 65

the fault here is i^2= -1 and -1 multiplied by -49 is +49 not -49

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2. Consider the division operations below and choose whether the result can be rational,
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Answer:

All are rational.

Step-by-step explanation:

1)

=1/3/3/5

=1/3×5/3

=5/9

5/9 is non-terminating and recurring number so it is rational.

2)

4/3√9/5

=4/3*3/5

=4/5

4/5 is a terminating number it is rational.

3)

2*√16/√4

=2*4/2

=4

4 is a natural/whole number it is also rational.

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4 0
3 years ago
Find the inverse of each function<br> Problem 1: Find the inverse of y = 3x - 8
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Switch y and x to find the inverse:
x = 3y - 8
Now just solve for y
y = x/3 + 8/3
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3 years ago
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A rectangular park has sidewalks on two adjacent sides. If it takes John 60 steps to
Sergeeva-Olga [200]

Answer:

Length = 80 m and breadth = 60 m If one moves along the two adjacent sides, one covers 80+60 = 140 m. Diagonal of the rectangle = √ ( length^2 + breadth^2) ...

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2 years ago
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Answer:

It would be A

Step-by-step explanation:

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3 years ago
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Alja [10]

Answer:

X=3

Y=1

Step-by-step explanation:

In solving simultaneous equations, there are three methods, we have the elimination method, substitution method or graphical method. But for the purpose of this question, we would be using Elimination method.

5y-4x =-7 Equation 1

2y+4x=14 Equation 2

Since x has the same coefficient, it's easy to eliminate by adding up the two equations

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4x=12

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x= 3

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3 years ago
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