20 percent of 70 plants

8th grade math please help

stepan [7]

I am not in 8th grade but it might be the 2nd one

7 0

3 years ago

Read 2 more answers

I need help with this question

Novay_Z [31]

Answer:

$\frac{\sqrt{3} - 1}{2\sqrt{2}}$

$\frac{-(\sqrt{3} + 1)}{2\sqrt{2}}$

$- \frac{\sqrt{3} - 1}{\sqrt{3} + 1}$

Step-by-step explanation:

Given $\frac{11 \pi}{12} = \frac{3 \pi}{4} + \frac{\pi}{6}$

(A) $sin(\frac{11\pi}{12}) = sin (\frac{3 \pi}{4} + \frac{\pi}{6})$

We know that Sin(A + B) = SinA cosB + cosAsinB

Substituting in the above formula we get:

$sin (\frac{3\pi}{4} + \frac{\pi}{6}) = \frac{1}{\sqrt{2}} . \frac{\sqrt{3}}{2} + \frac{-1}{\sqrt{2}}. \frac{1}{2}$

$$ \implies \frac{1}{\sqrt{2}} (\frac{\sqrt{3} - 1}{2}) = \frac{\sqrt{3} - 1}{2\sqrt{2}}$

(B) Cos(A + B) = CosAcosB - SinASinB

$cos(\frac{11\pi}{12}) = cos(\frac{3\pi}{4} + \frac{\pi}{6}})$

$\implies \frac{-1}{\sqrt{2}}. \frac{\sqrt{3}}{2} - \frac{1}{\sqrt{2}} . \frac{1}{2}$

$\implies cos(\frac{11\pi}{12}) = cos(\frac{3\pi}{4} + \frac{\pi}{6})$

$$ = \frac{-(\sqrt{3} + 1)}{2\sqrt{2}}$

(C) Tan(A + B) = $\frac{Sin(A +B)}{Cos(A + B)}$

From the above obtained values this can be calculated and the value is $- \frac{\sqrt{3} - 1}{\sqrt{3} + 1}$ .

3 0

3 years ago

I’m really struggling would really appreciate if someone could help!!!!!

ladessa [460]

9514 1404 393

Answer:

A) 29/40

Step-by-step explanation:

The formula for this is ...

P(A or B) = P(A) + P(B) - P(A and B)

Filling in the given values, you have ...

P(A or B) = 9/20 +1/2 - 9/40

P(A or B) = 18/40 +20/40 -9/40 = (18+20-9)/40

P(A or B) = 29/40 . . . . matches choice A

7 0

3 years ago

To the nearest hundredth of a percent, what is the percent of change from 2007 to 2013?

Sati [7]

Answer:99.70

Step-by-step explanation:

X/100×2013=2007

2013x=2007×100

2013x=200700

Divide both sides by 2013

X=200700/2013

X=99.70

5 0

4 years ago

Read 2 more answers

angle CMW and angle WML together form angle CML. CMW is a right angle. what is true about angle CML?

likoan [24]

CML can either be an acute angle or an obtuse angle varying on where L is placed.

6 0

3 years ago