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zavuch27 [327]
3 years ago
12

If sound travels 2 miles in 10 seconds, how far does sound travel in 4 minutes?

Mathematics
1 answer:
blsea [12.9K]3 years ago
5 0

Answer:

480 miles

Step-by-step explanation:

10 x 6 = 60. 60 x 2 = 120. 120 x 4 = 480

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The picture below shows the path that Puppy Liz is running. The electrical post is 40 feet tall. Puppy Liz usually starts at the
zimovet [89]

Answer:

Puppy Liz runs 34.61 ft.

Step-by-step explanation:

From the figure we can extract two triangles: one with angle 34° and adjacent 40ft, the other with angle 34°+23° and adjacent 40ft.

Let us call the distance from the pole to the fire hydrant d_1, and the distance from the pole to the bench d_2, then the distance d from the fire hydrant to the bench is

d=d_2-d_1

which is the distance the Puppy Liz runs.

Now, from trigonometry we have

tan(34^o)=\frac{d_1}{40}\\\\\therefore d_1= 40*tan(34^o)\\\\ \boxed{d_1=26.98ft}

and

tan(34^o+23^o)=\frac{d_2}{40}

d_2=40*tan(34^o+23^o)\\\\\boxed{d_2=61.59}

Therefore, the distance d Puppy Liz runs is

d=d_2-d_1

d=61.59ft-26.98ft\\\\\boxed{d=34.61ft}

6 0
3 years ago
Show that 3x^2 -2x + 1 is always greater than 0.<br> ( This is an Additional Math Question )
Leviafan [203]

Answer:

3x^2 -2x + 1 =3(x^2-2/3x+1/3)=3(x-1/3)^2+2/9*3= 3(x-1/3)^2+2/3

(x-1/3)^2 is greater or equal to zero

3(x-1/3)^2 is greater or equal to zero

and 2/3 is greater than zero

So there sum is greater than zero

Proved

Step-by-step explanation:

3x^2 -2x + 1 =3(x^2-2/3x+1/3)

Consider x^2-2/3x+1/3

Remember that (a-b)^2 =a^2-2ab+b^2

x^2=a^2

a=x

-2/3x= -2*x*b

b=1/3

S0 (x-1/3)^2= x^2-2/3x+1/9

x^2-2/3x+1/3= x^2-2/3x+1/9+1/3-1/9= (x-1/3)^2+2/9

3x^2 -2x + 1 =3(x^2-2/3x+1/3)=3(x-1/3)^2+2/9*3= 3(x-1/3)^2+2/3

(x-1/3)^2 is greater or equal to zero

3(x-1/3)^2 is greater or equal to zero

and 2/3 is greater than zero

So there sum is greater than zero

Proved

6 0
3 years ago
Help! Please try to do both of u can! 10 pts!
givi [52]

Answer:

54. slope: -1/5 y-intercept: -6

55. slope: -3x y-intercept: 12

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
22 Factor 6x² – 25x – 25
irina [24]

Answer:

(6x - 5)(x+5) (Answer A)

Step-by-step explanation:

Take a look at possible answer A:  (6x - 5)(x + 5)

Multiplying out these factors yields 6x² + 30x - 5x - 25.  This matches the original polynomial, 6x² - 25x - 25.

8 0
3 years ago
48/x = -8 I need help :(
marishachu [46]

Answer:

x=-6

Step-by-step explanation:

48/x=-8

times x on both sides of the equation

48=-8x

divide -8 on both sides of the equation

x=-6

4 0
3 years ago
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