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3 years ago

Twenty-eight is 40% of _____a0.

Mathematics

1 answer:

Alchen [17]3 years ago

3 0

Answer:

Step-by-step explanation:

hope this helps!

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(1+cos2x)/(1-cos2x) = cot^2x

sesenic [268]

We will turn the left side into the right side.

$\dfrac{1 + \cos 2x}{1 - \cos2x} = \cot^2 x$

Use the identity:

$\cos 2x = \cos^2 x - \sin^2 x$

$\dfrac{1 + \cos^2 x - \sin^2 x}{1 - ( \cos^2 x - \sin^2 x)} = \cot^2 x$

$\dfrac{1 - \sin^2 x + \cos^2 x }{1 - \cos^2 x + \sin^2 x} = \cot^2 x$

Now use the identity

$\sin^2 x + \cos^2 x = 1$ solved for sin^2 x and for cos^2 x.

$\dfrac{\cos^2 x + \cos^2 x }{\sin^2 x + \sin^2 x} = \cot^2 x$

$\dfrac{2\cos^2 x}{2\sin^2 x} = \cot^2 x$

$\dfrac{\cos^2 x}{\sin^2 x} = \cot^2 x$

$\cot^2 x = \cot^2 x$

8 0

3 years ago

Marta is making 3 servings of fruit salad.she adds 3/8 cup blueberries for each serving.her measuring cup holds 1/8 cup.how many

quester [9]

To solve this problem you must follow the proccedure shown below:

1. You have the following information given in the problem above:

- Marta is making 3 servings of fruit salad.
- Marta adds 3/8 cups blueberries for each serving.
- Her measuring cup holds 1/8 cup.

2. Then, you have:

1 time----1/8 cup
x----3/8 cups

x=(3/8)/(1/8)

x= 3x8/1x8
x=24/8
x=3 times

How many times must Marta measure 1/8 cup of blueberry to have enough for the fruit salad?

The answer is: 3 times

3 0

3 years ago

Zach is 4 years older than twice his sister maya’s age. maya is 5 years old. how old is zach?

SCORPION-xisa [38]

Zach is 14 bc...
-4 years older(+4) than twice (x2) Mayas age.
-Maya is 5
- the correct order is 5x2+4
-5x2=10, 10+4=14

4 0

3 years ago

Estimate each product : 1/9 x 83

Gnom [1K]

Answer:

8.5

Step-by-step explanation:

1/9=0.1111111111111

0.1111111111111=0.1

83=80 or 85

0.1*85=8.5

3 0

3 years ago

What percentage of rupees 20 is rupees 12?

slavikrds [6]

Let x℅

so , 20×X/100=12

......x=1200/20 = 60 ℅ ...answer !

5 0

3 years ago