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sukhopar [10]
3 years ago
7

Twice the sum of 18 and x is 42

Mathematics
1 answer:
nydimaria [60]3 years ago
4 0

Answer:

x=3

Step-by-step explanation:

We are taking 2 times the sum ( addition) of 18 and x

2 ( 18+x) = 42

Divide each side by 2

2 /2 ( 18+x) = 42/2

18+x = 21

Subtract 18 from each side

18+x-18 = 21-18

x = 3

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Braving blizzard conditions on the planet Hoth, Luke Skywalker sets out at top speed in his snowspeeder for a rebel base 4800 mi
____ [38]

Answer:

v_top = 2400 mi/hr

v_w = 400 mi/h

Step-by-step explanation:

Given:

- Total distance D = 4800 mi

- Headwind journey time taken t_up= 3 hr

- Tailwind journey time taken t_down = 2 hr

Find:

Find the top speed of Luke's snow speeder and the speed of the wind.

Solution:

- The speed of Luke v_l is in stationary frame is given by:

                           v_l = v_w + v_l/w

Where,

           v_w: Wind speed

           v_l/w: Luke speed relative to wind.

- The top speed is attained on his returned journey with tail wind. We will use distance time relationship to calculate as follows:

                         v_top = D / t_down

                         v_top = 4800 / 2

                        v_top = v_down = 2400 mi/hr

- Similarly his speed on his journey up with head wind was v_up:

                         v_up = D / t_up

                         v_up = 4800 / 3

                        v_up = 1600 mi/hr    

- Now use the frame relations to find the wind speed v_w:

                         v_down = v_w + v_l/w

                         v_up = -v_w + v_l/w    

- Solve equations simultaneously:

                         2400 =  v_w + v_l/w

                         1600 =  -v_w + v_l/w

                         4000 = 2*v_l/w

                         v_l/w = 2000 mi/h

                         v_w = 400 mi/h

7 0
3 years ago
HELP PLEASE I NEED HELP OH DEAR LORD
SashulF [63]
#5,

it says that the angle on top is 221, so you subtract that from 360,

360-221= the rest..... 139
 Now in that 139, you can see that there is a triangle with a right angle. so you can subtract 90 degrees from 139

139-90= 49
49 is the number you use to solve the rest.
3x + 4x = 7x
so 7x = 49
and then you divide 7 from both sides to isolate x, and you get your answer
7 0
3 years ago
I need to know how to subtract fractions 4 2/3 - 3/4
sergij07 [2.7K]

Answer: The answer would be 3.91666666667

3 0
3 years ago
simon sold 72 packages of popcorn. there are 9 packages in each box. if he has delivered 27 packages,how many boxes does Simon h
givi [52]
72-27 = 45
\\ 45/9 = 5
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4 0
3 years ago
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The slope of the graph of the equation y=2x-2 is 2 what is the y intercept
ehidna [41]

Answer:

the y intercept is -2


6 0
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