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tekilochka [14]

3 years ago

9

5c-1÷4=4+10c÷9 is there a solution or no solution and if there is I would like to see the steps in solving this equation so I ca

n show the steps on my paper.

1 answer:

vekshin13 years ago

6 0

I don’t think this will help exactly but I hope it does x

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Prove that:<br><br>cos20°cos40°cos80°=1/8

Naya [18.7K]

Answer:

see explanation

Step-by-step explanation:

Using the double angle identity for sine

sin2x = 2sinxcosx

Consider left side

cos20°cos40°cos80°

= $\frac{1}{2sin20}$ (2sin20°cos20°)cos40°cos80°

= $\frac{1}{4sin20}$ (2sin40°cos40°)cos80°

= $\frac{1}{4sin20}$ (sin80°cos80° )

= $\frac{1}{8sin20}$ (2sin80°cos80° )

= $\frac{1}{8sin20}$ . sin160°

= $\frac{1}{8sin20}$ . sin(180 - 20)°

= $\frac{1}{8sin20}$ . sin20°

= $\frac{1}{8}$ = right side , thus proven

7 0

2 years ago

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How do you calculate 278 × 11 using estimation?<br>

neonofarm [45]

Answer:

2800

Step-by-step explanation:

round 278 to 280

then round 11 to 10

then times the 2 answers together

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2 years ago

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Find the equation of the line.<br> Use exact numbers.

expeople1 [14]

Answer:

y=2/3x+4

Step-by-step explanation:

rise 2

run 3

y-intercept 4

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2 years ago

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The first term of an arithmetic sequence is -5, and the tenth term is 13. Find the common difference.

dlinn [17]

$\bf n^{th}\textit{ term of an arithmetic sequence} \\\\ a_n=a_1+(n-1)d\qquad \begin{cases} n=n^{th}\ term\\ a_1=\textit{first term's value}\\ d=\textit{common difference}\\[-0.5em] \hrulefill\\ a_1=-5\\ n=10\\ a_{10}=13 \end{cases} \\\\\\ a_{10}=a_1+(10-1)d\implies 13=-5+(10-1)d \\\\\\ 13=-5+9d\implies 18=9d\implies \cfrac{18}{9}=d\implies \boxed{2=d}$

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3 years ago

Each baseball team in a baseball league has 14 players. A total of 56 players signed up to play. If t represents the number of t

yawa3891 [41]

A is the answer because 14x4=56

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3 years ago

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