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2 years ago

A tree is 4 meters tall. About how tall is the tree in feet (ft)? (1 meter is approximately 39 inches.)

Mathematics

2 answers:

Stella [2.4K]2 years ago

6 0

the answer is C.) 13.0

I just took it and got it right

lana66690 [7]2 years ago

5 0

Your answer is A :)
Hope i helped :)

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Sean tossed a coin off a bridge into the stream below. The path of the coin can be represented by the equation 2 h tt = − 16t^2+

tekilochka [14]

Answer:

It will take 5.61 seconds for the coin to reach the stream.

Step-by-step explanation:

The height of the coin, after t seconds, is given by the following equation:

$h(t) = -16t^{2} + 72t + 100$

How long will it take the coin to reach the stream?

The stream is the ground level.

So the coin reaches the stream when h(t) = 0.

$h(t) = -16t^{2} + 72t + 100$

$-16t^{2} + 72t + 100 = 0$

Multiplying by (-1)

$16t^{2} - 72t - 100 = 0$

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

$ax^{2} + bx + c, a\neq0$ .

This polynomial has roots $x_{1}, x_{2}$ such that $ax^{2} + bx + c = a(x - x_{1})*(x - x_{2})$ , given by the following formulas:

$x_{1} = \frac{-b + \sqrt{\bigtriangleup}}{2*a}$

$x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}$

$\bigtriangleup = b^{2} - 4ac$

In this question:

$16t^{2} - 72t - 100 = 0$

$a = 16, b = -72, c = -100$

$\bigtriangleup = (-72)^{2} - 4*16*(-100) = 11584$

$t_{1} = \frac{-(-72) + \sqrt{11584}}{2*16} = 5.61$

$t_{2} = \frac{-(-72) - \sqrt{11584}}{2*16} = -1.11$

Time is a positive measure, so we take the positive value.

It will take 5.61 seconds for the coin to reach the stream.

3 0

2 years ago

PLEASE HELP ASAP

Crank

Answer: it might be 4 because 5x=20

Step-by-step explanation:

7 0

2 years ago

What is 6(7-2p) =12p+42

mafiozo [28]

answer:

p = 0

step-by-step explanation:

6 (7-2p) = 12p + 42

42 - 12p = 12p + 42

+12p +12p

_______________

42 = 24p + 42

-42 -42

_____________

0 = 24p

_ ___

24 24

0 = p

<em>hope this helps! ❤ from peachimin (aka kayla)</em>

4 0

2 years ago

What is 1 1/8 plus 5/8

slava [35]

Answer:

1 6/8

Step-by-step explanation:

add 1/8 to 5/8 by adding just the numerators

1 + 5 = 6

now you have 6/8. add the 1 and you have 1 6/8

hope this helped, have a good day :)

6 0

2 years ago

Read 2 more answers

Identify the domain of the exponential function shown in the following graph. Explain how you know.

Dmitriy789 [7]

Answer:

The domain of the function is R i.e. any real value.

Step-by-step explanation:

The given figure is a graph on the coordinate plane of the function $y = 10^{x}$

Now, the domain of a function means that the values of x (Independent variable) for which the function is valid i.e. the y values are real.

It is clear from the equation given above that for any real value of x there will be a real corresponding value of y.

Therefore, the domain of the function is R i.e. any real value. (Answer)

6 0

2 years ago