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3 years ago

Need heed help pls bees

Mathematics

1 answer:

Musya8 [376]3 years ago

8 0

Answer:

-4.9t^2+13t+1=0

Step-by-step explanation:

it isn't green, that is an impossible trajectory, black doesn't start 1m above the ground, and red doesn't have a velocity of 13m/s

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Find the percent decrease. Round to the nearest whole percent.

My name is Ann [436]

Answer:

9% decrease

Step-by-step explanation:

Percentage Decrease = [ (Starting Value - Final Value) / |Starting Value| ] × 100

6 0

3 years ago

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Find f(-7) if f(x) = 2x+8.<br> A.-6<br> B.2<br> C.3 <br> D.22

Lynna [10]

Answer:

A. -6

Step-by-step explanation:

f(-7)=2(-7)+8

=(-14)+8

=-6

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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

Pls answer this with an explanation if you can

marta [7]

Answer:

There are 35 seventh-graders in the club

Step-by-step explanation:

4 : 7

20 : ?

20/4=5 so you do this to the other side as well,so 7*5 =35

answer=35

5 0

3 years ago

Solve the equation. 6=a/4+2

Olin [163]

Answer:

it equals 3.5

Step-by-step explanation:

8 0

3 years ago

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