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Helen [10]
3 years ago
5

Please help me with this

Mathematics
1 answer:
Firdavs [7]3 years ago
7 0

Answer:

A: 5x^2 + 42x + 16

B: 12x + 20

C: 351 units

Step-by-step explanation:

A: (5x + 2) * (x + 8) is the same as x(5x + 2) + 8(5x + 2). You just need to solve and simplify that for the area:

x(5x + 2) + 8(5x + 2)

= 5x^2 + 2x + 40x + 16

= 5x^2 + 42x + 16

B: You need to do 2l + 2w, or 2(5x + 2) + 2(x + 8):

2(5x + 2) + 2(x + 8)

= 10x + 4 + 2x + 16

= 12x + 20

C: You can either replace the x in the equation with 5 or replace the x in the figure itself with 5. I will replace the one in the figure with 5 because it is a lot easier:

(5(5) + 2) * (5 + 8)

= 27 x 13

= 351 units

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What basic trigonometric identity would you use to verify that sinx cosx tanx=1-cos^2x
andre [41]

Answer:

sin^2x+cos^2x=1 is used to prove the given equation.

Step-by-step explanation:

We have given an equation:

sinx\cdot cosx\cdot tanx=1-cos^2x

We will consider right hand side first

tan x can be written as:

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So, on substituting tan x in the left hand side of the given equation we get:

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Cancel common term from denominator and numerator which is cosx we get

sin^2x

And we have an identity:

sin^2x+cos^2x=1

\Rightarrow sin^2x=1-cos^2x

Hence, right hand side is equal to sin^2x.


5 0
3 years ago
Read 2 more answers
Of the students at Milton middle school , 140 are girls. If 50% of the students are girls, how many total students are there at
denpristay [2]

Answer:

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Step-by-step explanation:

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8 0
3 years ago
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3 years ago
Can someone help me plz ​
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Answer:

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Step-by-step explanation:

I hope it is right, but I just did quick math.

so it might also be 82 if you round up to the nearest number. (sorry if this is confusing)

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