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NikAS [45]
3 years ago
8

Arnold can read 3 pages in 7 minutes. Brenda can read 8 pages in 14 minutes. Who is the faster reader? Justify your answer.

Mathematics
1 answer:
Mrac [35]3 years ago
8 0

Answer:

Brenda

Step-by-step explanation:

You can divide the number of pages by the number of minutes to find the amount of minutes it takes to read 1 page. For Arnold, 3 pages / 7 minutes = 1 page per approximately 0.43 minutes. For Brenda, 8 pages / 14 minutes = 1 page per approximately 0.57 minutes. Brenda reads slightly faster since 0.57 > 0.43

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Is sarah faster than Katie? and what is the average rate?​
slamgirl [31]

Step-by-step explanation:

here's the solution: -

Average time taken by sarah :

=》

\frac{79 + 70 + 68 + 75 + 69 + 64 + 69 + 75 + 64 + 76}{10}

=》

\frac{709}{10}

=》

70.9

average time taken by sarah = 70.9 seconds

now,

average time taken by katie :

=》

\frac{ 79 + 79 + 76 + 81 + 89 + 76 + 64 + 85 + 82 + 78}{10}

=》

\frac{789}{10}

=》

78.9

average time taken by katie = 78.9 seconds

so, sarah is more efficient (faster) than katie.

i agree with sarah.

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7 0
3 years ago
Read 2 more answers
Prove that lines 3x-4y=12 and 3y=12-4x are perpendicular.
Svetllana [295]

Answer:

see explanation

Step-by-step explanation:

If 2 lines are perpendicular then the product of their slopes equals - 1

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Consider the given equations

3x - 4y = 12 ( subtract 3x from both sides )

- 4y = - 3x + 12 ( divide terms by - 4 )

y = \frac{3}{4} x - 3 ← in slope- intercept form

with slope m = \frac{3}{4}

3y = 12 - 4x = - 4x + 12 ( divide terms by 3 )

y = - \frac{4}{3} x + 4 ← in slope- intercept form

with slope m = - \frac{4}{3}

Then

\frac{3}{4} × - \frac{4}{3} = - 1

Since the product of their slopes = - 1 then the lines are perpendicular

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2 years ago
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Serga [27]

Answer:

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Step-by-step explanation:

3 0
2 years ago
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alexandr402 [8]

Answer:

25

Step-by-step explanation:

2x+2+5x+3=180 (angles on a straight line)

7x+5=180

7x=180-5

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3 0
3 years ago
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