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3 years ago

HELP I FORGOT TO PUT THE FILE IN SO HERE IT IS :)

Mathematics

2 answers:

Kay [80]3 years ago

6 0

Answer: 0.525

You have to divide 21 by 40 and you get the answer of 0.525

xeze [42]3 years ago

3 0

Answer:

0.525

21/40 as a decimal is 0.525.

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Prove this trigonometric equation;<br><br> - tan^2x + sec^2x = 1,

alekssr [168]

Hey there :)

- tan²x + sec²x = 1 or 1 + tan²x = sec²x

sin²x + cos²x = 1
Divide the whole by cos²x

$\frac{sin^2x}{cos^2x} + \frac{cos^2x}{cos^2x} = \frac{1}{cos^2x}$

$\frac{sinx}{cosx} = tanx$ so $\frac{sin^2x}{cos^2x} = tan^2x$
and
$\frac{1}{cosx} = secx$ so $\frac{1}{cos^2x} = sec^2x$

Therefore,
tan²x + 1 = sec²x
Take tan²x to the other side {You will have the same answer}

1 = - tan²x = sec²x or sec²x - tanx = 1

3 0

3 years ago

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Goryan [66]

Honestly I don’t even know

4 0

3 years ago

A treatment is administered to a sample of n = 9 individuals selected from a population with a mean of µ = 80 and a standard dev

stepan [7]

Answer:

a) M =82

Step-by-step explanation:

Let´s study this as a Normal distribution.

As we know in a normal distribution the z score is = (X-μ)/(sd/sqrt(n))

where

X = mean for the taken sample = What we want to know in this problem

μ = Total population mean =80

sd= standard deviation= 12

n = sample size=9

So in this case z=( X-80)/(12/sqr(9))= (X-80)/4

also we know that the effect size taken by the machine is 0.5, which is the same as the z-score

so...

0.5 = (X-80)/4 => 0.5*4 = X-80

2+80 = X

X = 82

4 0

3 years ago

In a classroom, 4/6of the students are wearing

Airida [17]

The answer is
4/6-3/6=1/6

6 0

2 years ago

What number is not a composite number 2,9,15,21?

Citrus2011 [14]

2 is not a composite number

7 0

3 years ago