3 years ago

HAI I NEED HALP SO YEAH PLZ

Mathematics

1 answer:

alina1380 [7]3 years ago

3 0

Answer: The answer is E

Step-by-step explanation:

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**A rock dropped from a 100 foot tower.

mars1129 [50]

Answer:

2.83 s

Step-by-step explanation:

We are given that

$h(t)=-16t^2+10t+100$

When a rock reached the ground then h(t)=0

$-16t^2+10t+100=0$

$16t^2-10t-100=0$

Using quadratic formula

$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

$t=\frac{10\pm\sqrt{(-10)^2-4\times 16\times (-100)}}{2(16)}$

$t=\frac{10\pm\sqrt{100+6400}}{32}$

$t=\frac{10+\sqrt{6500}}{32}=2.83$

$t=\frac{10-\sqrt{6500}}{32}=-2.2$

Time cannot be negative .Therefore, negative value of t can not be possible.

Hence, the rock takes 2.83 sec to reach the ground.

8 0

4 years ago

Which of the following steps would you perform to the system of equations below so that the equations have opposite y-coefficien

denis23 [38]

I think B not 100%shure ,you could prob go ask this on yahoo and get a bit more help ;) sorry I couldent help more

3 0

3 years ago

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If correct I will give brainly

Marizza181 [45]

Answer:

Step-by-step explanation:

all you need to do is switch the x with 12

5 0

3 years ago

Determine the area of the triangular ABC with AC=5cm and height DB=30 mm.<br>

Lady_Fox [76]

Answer:

750 mm²

Step-by-step explanation:

<h3>Area of triangle:</h3>

To find the area of the triangle, multiply the base and height and then divide the result by 2.

$\sf \boxed{\bf Area \ of \ triangle = \dfrac{1}{2}*base *height}$

base = AC = 5 cm = 50 mm

height = DB = 30 mm

$\sf = \dfrac{1}{2}*50*30\\\\= 25 *30\\\\= 750 \mm^2$

7 0

2 years ago

Solve for x the answer should be x=10 show steps

Scorpion4ik [409]

Answer:

$7x = 8x - 10 \\ 10 = 8x - 7x \\ x = 10$

5 0

3 years ago

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