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lbvjy [14]
3 years ago
9

2x(5x + 3) + 7(5x + 3) 7 x 10

Mathematics
1 answer:
jonny [76]3 years ago
5 0

Answer:

Step-by-step explanation:

10x+6x+35x+21=51x+21

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mart [117]
16 Im pretty sure it is.
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3 years ago
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Urgent!
boyakko [2]

Step-by-step explanation:

18.

the last one.

-4.9t² + 24.5t + 117.6 = 0

the ball starts at 117.6 meters height. then, during the first seconds the thrust upwards is adding height, until finally, with more and more seconds passing, gravity will win with a vengeance and pulls the ball down faster and faster than any other force in any other direction.

19.

the general solution for a quadratic equation

y = ax² + bx + c

is

x = (-b ± sqrt(b² - 4ac))/(2a)

in our case

x = t

a = -4.9

b = 24.5

c = 117.6

t = (-24.5 ± sqrt(600.25 - -4×4.9×117.6))/-9.8 =

= (-24.5 ± sqrt(600.25 + 2304.96))/-9.8 =

= (-24.5 ± sqrt(2905.21))/-9.8 = (-24.5 ± 53.9)/-9.8

t1 = (-24.5 + 53.9)/-9.8 = -3

t2 = (-24.5 - 53.9)/-9.8 = 8

a negative time does not make any sense, so the real solution is : the ball reached the ground after 8 seconds.

20.

now the equation is

-4.9t² + 24.5t + 117.6 = 49

but this is quickly transformed again into a "= 0" equation :

-4.9t² + 24.5t + 68.6 = 0

t = (-24.5 ± sqrt(600.25 - -4×4.9×68.6))/-9.8 =

= (-24.5 ± sqrt(600.25 + 1344.56))/-9.8 =

= (-24.5 ± sqrt(1944.81))/-9.8 = (-24.5 ± 44.1)/-9.8

t1 = (-24.5 + 44.1)/-9.8 = -2

t2 = (-24.5 - 44.1)/-9.8 = 7

again, negative time does not make sense.

the ball will be at 49 m height after 7 seconds.

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2 years ago
Find the unit rate in each situation below in miles per hour.
sveticcg [70]
B. Is the correct answer
6 0
3 years ago
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Can anybody help me please
vagabundo [1.1K]

Answer:

Not entirely positive of about the answers, but all of the values would equal 15

First Y = 5

First X = 15

Second X = -3

6 0
3 years ago
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If 54 oranges cost N36. Find the costs of 3 oranges
Rus_ich [418]

Answer:

4.5

Step-by-step explanation:

because if you divide 54 and 36 you get 1.5 and 1.5 x 3 is 4.5

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