What is equal to sin21

Mathematics

1 answer:

cluponka [151]2 years ago

5 0

Sin is opposite/hypotenuse, so find the opposite side to that angle and divide that by the hypotenuse.

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Marques drops a plate from a height of 5 feet. When will the plate hit the ground?

nadya68 [22]

Answer:

Option A. about 1 seconds

Step-by-step explanation:

Let the initial speed u and the final speed v

Time t , distance s and acceleration of gravity g

The equation of motion are:

v = u + gt ⇒(1)

s = ut + 0.5 gt² ⇒(2)

v² = u² + 2gs ⇒(3)

Marques drops a plate from a height of 5 feet.

So, u = 0 , s = 5 ft , g = 9.8 m/sec²

Substitute at (2)

s = ut + 0.5 gt²

5 = 0 * t + 0.5 * 10 * t²

∴ t² = 5/(0.5*9.8) = 1.02

∴ t = √1.02 = 1.01 seconds ≈ 1 seconds (to the nearest integer)

The answer is option A. about 1 seconds

4 0

2 years ago

Write the expression nine divided by the quantity of x plus y

seropon [69]

9514 1404 393

Answer:

$\text{A)}\quad\dfrac{9}{x+y}$

Step-by-step explanation:

In the English expression, you need to understand that "A divided by B" means that A is the numerator and B is the denominator of the fraction representing the division. Here, "B" is "the quantity of ...", which means that the stuff after "of ..." is to be treated as a single item, the denominator in this case. That item is "x plus y." So, the expression in math terms is ...

$\dfrac{9}{x+y}$