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2 years ago

How many students ran less than 1 mile

Mathematics

1 answer:

fgiga [73]2 years ago

3 0

Can you write the full sentence?..

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A rock is thrown from the top of a tall building.The distance in feet between the rock and the ground t seconds after thrown is

marusya05 [52]

Answer:

0.448 seconds

Step-by-step explanation:

d = -16t² -4t + 412

find t when d = 407

substituting d = 407 into the equation:

407 = -16t² -4t + 412 (subtract 407 from both sides)

-16t² -4t + 412 - 407 = 0

-16t² -4t + 5 = 0 (multiply both sides by -1)

16t² + 4t - 5 = 0

solving using your method of choice (i.e completing the square or using the quadratic equation), you will end up with

t = (-1/8) (1 + √21)= -0.70 seconds (not possible because time cannot be negative)

t = (-1/8) (1 -√21) = 0.448 seconds (answer)

4 0

3 years ago

Mila used the multiplication property to justify the first step in solving an equation. The original equation was x/2+4=10. What

Nookie1986 [14]

Answer: $x+8=20$

Step-by-step explanation:

Given

Equation is $\frac{x}{2}+4=10$

Mila uses the first step as multiplication to make the coefficient of x, 1

Mila maybe have multiplied the whole equation by 2 i.e.

$\Rightarrow 2\left(\dfrac{x}{2}+4=10\right)\\\\\Rightarrow x+8=20$

8 0

3 years ago

An increase in wind causes this current to increase what type of current is it

nikitadnepr [17]

Surface is the answer

5 0

3 years ago

Does the equation 2x + 3 = 11 go through the point (1,4)?

Jet001 [13]

Answer: yes it does

2x= 8
x= 8/2

x=4.

6 0

3 years ago

Can someone help me with this question

Contact [7]

Answer:

Very Simple!

Step-by-step explanation:

Just use the distance formula!

(I'm in a math class right now, so I have to keep it brief)

Distance Formula, example:

$AB=\sqrt{(x_{1}-x_{2})^{2}+(y_{1}-y_{2})^{2} }$

Just input the x and y values from A and B into here, and then that's it!

Hope this helps!

Happy Geometry!

4 0

2 years ago