3 years ago

I need help on this what's the answer for it 2/7 + 2/3 =

Mathematics

2 answers:

Allushta [10]3 years ago

4 0

Your answer will be 20/21. (:

slava [35]3 years ago

3 0

20/21 is the answer to your problem.

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Simplify by dividing (-3/8) -5/9

Elodia [21]

Answer:

$\frac{-27}{40}$

Step-by-step explanation:

$(\frac{-3}{8})$ ÷ $\frac{5}{9}$

$\frac{-3}{8}$ × $\frac{9}{5}$

$\frac{-27}{40}$

6 0

2 years ago

7+2n=8n-5 <br>n=? <br>whatsl does n equal

Westkost [7]

8n -2n=7+5

6n =12

n =2

this is the answer

8 0

2 years ago

Read 2 more answers

(cos A + cos b)^2 + (sin A + sin B)^2=?

emmasim [6.3K]

First, we expand the equation:

$cos^{2}A+2cosAcosB+ cos^{2}B+sin^{2}A+2sinAsinB+sin^{2}B$

Then, we combine certain terms in order to simplify them using trigonometry identities.

$cos^{2}A+sin^{2}A+cos^{2}B+sin^{2}B+2cosAcosB+2sinAsinB$

Note these identities:
Pythagoran relation: $cos^{2}A+sin^{2}A = cos^{2}B+sin^{2}B=1$
Sum and Difference Formula/Identities: $cos(A-B) = cosAcosB+sinAsinB$

Thus, if we apply these identities, the simplified equation would be:
$2(cos(A-B))+2$

Simplying further, the answer would be

$2[cos(A-B)+1]$

6 0

3 years ago

A helpful hand please

Tpy6a [65]

$\bf s=\sqrt{2gh}\quad 
\begin{cases}
s=speed\\
g=gravity\\
h=height\\
-----\\
s=34\\
g=32
\end{cases}\implies s^2=2gh\\\\\\ \cfrac{s^2}{2g}=h\implies \cfrac{34^2}{2\cdot 32}=h$

3 0

3 years ago

F(-3)=–2a² – 5a + 4 what would the answer be or how would u solve it

Marat540 [252]

F(-3)=-2(-3)^2-5(-3)+4 <---- Plug in -3
F(-3)=-2(9)+15+4
F(-3)=-18+15+4
F(-3)=7

F(-3)=7

8 0

2 years ago