I really need help with my math someone please help

Mathematics

1 answer:

Maslowich3 years ago

7 0

Answer:

∠ A = 56°

Step-by-step explanation:

the sum of the 3 angles in a triangle = 180°

sum the 3 angles and equate to 180

2x + 3x + 40 = 180

5x + 40 = 180 ( subtract 40 from both sides )

5x = 140 ( divide both sides by 5 )

x = 28

then

∠ A = 2x = 2 × 28 = 56°

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A model rocket is launched from the top of a building. The height(in meters) of the rocket above the ground is given by h(t)=-6t

Shalnov [3]

Answer:

Step-by-step explanation:

I don't know if you are a calculus student, but since calculus is the easiest way to solve this, that's what I used. The position equation is

$s(t)=-6t^2+24t+14$

and the velocity function, the first derivative, is

$v(t)=-12t+24$

From Physics, you should know that the velocity of an object is 0 at its highest point. That means that if we sub in a 0 for the velocity and solve for t, we find the time at which the object is at its highest point. That is:

$0=-12t+24$ and

$0=-12(t-2)$

By the Zero Product Property,

-12 definitely does not equal 0, so that means that

t - 2 = 0 and

t = 2 seconds.

So at 2 seconds, the object is at its highest point. Go back to the position function now and sub in a 2 for t to find the height of the object at 2 seconds.

$s(2)=-6(2)^2+24(2)+14$ so