Simplify this expression. 20.25 – 9 3 + 11

Mathematics

1 answer:

34kurt3 years ago

6 0

Answer:

-61.75

Step-by-step explanation:

20.25 - 93+11=-61.75

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For f(x) = x² - 3x - 9 and g(x) = x – 7, find (f – g)(x).

zloy xaker [14]

We know that According to Algebra of Real Functions :

If f and g are two real functions which are defined under the same domain then (f - g)(x) = f(x) - g(x)

Given f(x) = x² - 3x - 9 and g(x) = x - 7

⇒ (f - g)(x) = f(x) - g(x)

⇒ (f - g)(x) = x² - 3x - 9 - (x - 7)

⇒ (f - g)(x) = x² - 3x - 9 - x + 7

⇒ (f - g)(x) = x² - 4x - 2

6 0

3 years ago

Don't know how to express the value of X as any of those answer choices

Alekssandra [29.7K]

9514 1404 393

Answer:

x = √(w(w+z))

Step-by-step explanation:

The idea with a right-triangle figure of this sort is that all of the triangles are similar. Here, x is the short side of ∆ABC, and the hypotenuse of ∆BDC. This suggests you want to write a similarity statement involving the short side and hypotenuse.

BC/AC = DC/BC . . . . . short side/hypotenuse

BC² = AC·DC . . . . . . cross multiply

x² = (w+z)w . . . . . . substitute letter values

Taking the square root and rearranging to the form of the applicable answer choice, this is ...

$\boxed{x=\sqrt{w(w+z)}}$