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4 years ago

Four questions need help need steps if knowledge

Mathematics

1 answer:

Blababa [14]4 years ago

3 0

1. (-9+14)/2,(-20+12)/2 =(2.5,-4) c:

2. (-4+2)/2, (-2+6)/2= (-1,2)

3.(5,1)

4. square root of (7^2 +19^2) =20.25

5. square root of (11^2 + 14^2)= 17.8

6. i can't see the graph for this one

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4/5G + 42 = 2.8G + 18<br> Plz solve with an explanation

inysia [295]

Answer:

Step-by-step explanation:

Simplify \frac{4}{5}G

G to \frac{4G}{5}

\frac{4G}{5}+42=2.8G+18

+42=2.8G+18

Multiply both sides by 5.

4g + 210 = 14g + 90

Simplify

14G + 90 - 4G to 10G + 90

Subtract 90 from both sides.

210-90=10G210−90=10G

Simplify 210-90210−90 to 120120.

120=10G120=10G

Divide both sides by 1010.

\frac{120}{10}=G

120

Simplify \frac{120}{10}

120

to 1212.

12=G12=G

Switch sides.

G=12G=12

SORRY ABOUT ALL THIS WORK...

3 0

3 years ago

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a sequence starts a 200 and 30 is subtracted each time 200,170,140 what are the first two numbers in the sequence that are kess

Snowcat [4.5K]

<h3>Answer: -10 and -40</h3>

===============================================================

Explanation:

a = 200 = first term

d = -30 = common difference

Tn = nth term

Tn = a + d(n-1)

Tn = 200 + (-30)(n-1)

Tn = 200 - 30n + 30

Tn = -30n + 230

Set Tn less than 0 and isolate n

Tn < 0

-30n + 230 < 0

230 < 30n

30n > 230

n > 230/30

n > 7.667 approximately

Rounding up to the nearest whole number gets us $n \ge 8$

So Tn starts to turn negative when n = 8

We can see that,

Tn = -30n + 230

T7 = -30*7 + 230

T7 = 20

and

Tn = -30n + 230

T8 = -30*8 + 230

T8 = -10 is the 8th term

and lastly

Tn = -30n + 230

T9 = -30*9 + 230

T9 = -40 is the ninth term

Or once you determine that T7 = 20, you subtract 30 from it to get 20-30 = -10 which is the value of T8. Then T9 = -40 because -10-30 = -40.

5 0

3 years ago

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What is m∠2?<br> What is m∠1?

Greeley [361]

Answer:

<2 = 75

<1 = 105

Step-by-step explanation:

<2 and 75 are alternate interior angles and since the lines are parallel, they are equal

<2 = 75

<2 + <1 = 180 since the angles form a line

75+ <1 = 180

Subtract 75 from each side

<1 = 180-75

<1 = 105

6 0

3 years ago

Read 2 more answers

PLEASE HELP (100 POINTS)

Artyom0805 [142]

$\\ \rm\Rrightarrow f(x)=-5cos\dfrac{x}{2}+5$

Compare to standard equation of SHM

$\\ \rm\Rrightarrow y=Acos(\omega x+\phi)$

Here

Amplitude=A=-5

$\\ \rm\Rrightarrow \omega x=\dfrac{x}{2}$

$\\ \rm\Rrightarrow \omega=1/2$

Well the above one are for extra knowledge .

Solution:-

$\\ \rm\Rrightarrow 10=-5cos\dfrac{x}{2}+5$

$\\ \rm\Rrightarrow 10-5=-5cos\dfrac{x}{2}$

$\\ \rm\Rrightarrow 5=-5cos\dfrac{x}{2}$

$\\ \rm\Rrightarrow cos\dfrac{x}{2}=-1$

$\\ \rm\Rrightarrow \dfrac{x}{2}=cos^{-1}(-1)$

$\\ \rm\Rrightarrow \dfrac{x}{2}=\pi$

$\\ \rm\Rrightarrow x=2\pi$

So.

$\\ \rm\Rrightarrow x=2\pi+2\pi n$

3 0

3 years ago

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In order for the data in the table to represent a linear function with a rate of change of –8, what must be the value of m? m =

pogonyaev

19 because it's being subtracted by 8

4 0

3 years ago

Read 2 more answers