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3 years ago

During track practice chris ran 2.5 laps in 81 seconds what was his average time per lap

Mathematics

1 answer:

bonufazy [111]3 years ago

7 0

32.4 seconds per lap

81/2.5=32.4

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To convert 45000 inches into miles which two ratios could you multiply by

77julia77 [94]

45000 x 63360

Hope this helped!

3 0

4 years ago

Write the standard equation of the ellipse with center at the origin, and vertices at (-4,0), (4,0), (0, -3), and (0,3).

levacccp [35]

9514 1404 393

Answer:

(a) x^2/16 +y^2/9 = 1

Step-by-step explanation:

The form for the equation of an ellipse centered at the origin is ...

(x/(semi-x-axis))^2 +(y/(semi-y-axis))^2 = 1

The vertex values tell you the semi-x-axis is 4 units, and the semi-y-axis is 3 units. Then you have ...

(x/4)^2 +(y/3)^2 = 1

x^2/16 +y^2/9 = 1

In case you don't remember that form, you can try any of the points in the equations. The equation that works will quickly become apparent.

5 0

3 years ago

Kyoko is reading a book by her favorite author. She read the first 20 pages in One-half of an hour. Reading at the same pace, Ky

eduard

Answer:

It will take her 3 hours to read 120 pages.

Step-by-step explanation:

The number of pages read(y) after x hour can be modeled by a linear function in the following format:

$y = ax + b$

In which a is the number of pages read per hour and b is the initial number of pages read.

A straight line goes through (0, 0)

This means that when $x = 0, y = 0$

$y = ax + b$

$0 = a*0 + b$

$b = 0$

(0.5, 20)

When $x = 0.5, y = 20$

$y = ax$

$20 = 0.5a$

$a = \frac{20}{0.5}$

$a = 40$

The function in:

$y(x) = 40x$

According to the graph, which statement must be true?

It will take her 2 hours to read 60 pages.

$y(2) = 40*2 = 80$

Less than 2 hours for 60 pages, so this is false.

It will take her 3 hours to read 120 pages.

$y(3) = 40*3 = 120$

This statement is true.

It will take her 4 hours to read 180 pages.

$y(4) = 40*4 = 160$

More than 4 hours to read 180 pages. So false.

It will take her 5 hours to read 210 pages.

$y(5) = 40*5 = 200$

More than 5 hours to read 210 pages. So false.

6 0

4 years ago

If two sides of a rectangle are 5 units and 9 units, what is the perimeter?

Mariana [72]

The perimeter is 28 bc 5+5 is 10 and 9+9 is 18 so if you add 10 and 18 you get 28. Hope it helps:)
(please mark brainliest )

3 0

3 years ago

What is 0.000 002 in standard form

Vsevolod [243]

Answer:

$0.000 002 = 2 \times {10}^{ - 6}$

Step-by-step explanation:

It is already in standard form and can be expressed in scientific form as:

$0.000 002 = 2 \times {10}^{ - 6}$

5 0

3 years ago

Read 2 more answers