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3 years ago

Much help needed please

Mathematics

2 answers:

alisha [4.7K]3 years ago

6 0

Answer: 0.8

Step-by-step explanation:

Jlenok [28]3 years ago

3 0

There is 9 counters all together and if 2 are picked out at random which are red then it would be 2/9

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A large water tank measures 6 feet across and 4 feet high. It is being filled with water at a rate of 10 gallons per minute. Abo

pentagon [3]

1.4 hours

It took a while to get this one, and I must admit, I'm not the best at explaining anything so I'm simply going to leave the answer above to help those who are stuck.

8 0

3 years ago

Which graph below shows plots of equivalent ratios for this situation?

Margaret [11]

Answer:

Step-by-step explanation:

5 0

3 years ago

Sin(A+B) sin(A-B) /sin^A Cos^B=1-cot^A Tan^B

telo118 [61]

In order to prove

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

Let's write both sides in terms of $\sin(x),\ \sin^2(x),\ \cos(x),\ \cos^2(x)$ only.

Let's start with the left hand side: we can use the formula for sum and subtraction of the sine to write

$\sin(x+y)=\cos(y)\sin(x)+\cos(x)\sin(y)$

and

$\sin(x-y)=\cos(y)\sin(x)-\cos(x)\sin(y)$

So, their multiplication is

$\sin(x+y)\sin(x-y)=(\cos(y)\sin(x))^2-(\cos(x)\sin(y))^2\\=\cos^2(y)\sin^2(x)-\cos^2(x)\sin^2(y)$

So, the left hand side simplifies to

$\dfrac{\cos^2(y)\sin^2(x)-\cos^2(x)\sin^2(y)}{\sin^2(x)\cos^2(y)}$

Now, on with the right hand side. We have

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

Now simply make this expression one fraction:

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

And as you can see, the two sides are equal.

6 0

4 years ago

Heyyyyyy lol pls help

Zolol [24]

Answer:

Step-by-step explanation:

The whole line is 180 degrees. First, you have to set up an equation. This equation would be 3x+94+x+36+2x-4=180. You can then combine like terms. The equation would now be 6x+126=180. Then subtract 126 from both sides of the equation. This would give you 6x=54. Divide 6x on both sides. The answer is 9.

8 0

3 years ago

Which is a correct way of evaluating the expression 30b+12b for b=5?

tatiyna

30x5+12x5=210

150+60=210

8 0

3 years ago

Read 2 more answers

Much help needed please ​

Much help needed please