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3 years ago

F(x) = x² + 7 X(-2) =

Mathematics

1 answer:

gizmo_the_mogwai [7]3 years ago

4 0

Answer:

hope it will help you

Step-by-step explanation:

f(x)=x²+7

X(-2)=?

therefore X(-2)=(-2)²+7

=4+7

=11

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jekas [21]

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0.821*8.4 ≤-6.7+p ⇒

6.8964≤-6.7+p ⇒

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13.5964 ≤ p

This is option C.

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2 years ago

What is the area of a triangle h=5 b=6

soldi70 [24.7K]

Answer:

The answer is 15

Step-by-step explanation:

area of triangle is half * base * height

So 1/2*5*6 is 15

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2 years ago

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At 4:30pm, the thermometer outside of Yasmine's window read 40*C. It had risen 8* between noon and 4:30pm and 5* between 7:00am

Natalija [7]

32* I belive if it had risen 8 degrees then 40 minus 8 is 32

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3 years ago

A parabola has a focus of F(2, -0.5) and a directrix of y=-1.5 P(x,y) represents any point on the parabola, while D(x, -1.5) rep

prohojiy [21]

The sketch of the parabola is attached below

We have the focus $(a,b) = (2, -0.5)$
The point $P(x,y)$
The directrix, c at $y=-1.5$

The steps to find the equation of the parabola are as follows

Step 1
Find the distance between the focus and the point P using Pythagoras. We have two coordinates; $(2, -0.5)$ and $(x,y)$ .
We need the vertical and horizontal distances to find the hypotenuse (the diagram is shown in the second diagram).
The distance between the focus and point P is given by
$\sqrt{ (x-a)^{2}+ (y-b)^{2} }$

Step 2
Find the distance between the point P to the directrix $c$ . It is a vertical distance between y and c, expressed as $y-c$

Step 3
The equation of parabola is then given as
$\sqrt{ (x-a)^{2}+ (y-b)^{2} }$ = $y-c$
$(x-a)^{2}+ (y-b)^{2}= (y-c)^{2}$ ⇒ substituting a, b and c
$(x-2)^{2}+ (y--0.5)^{2} = (y--1.5)^{2}$
$(x-2)^{2}+ (y+0.5)^{2}= (y+1.5)^{2}$ ⇒Rearranging and making $y$ the subject gives

$y= \frac{ x^{2} }{2} -2x+1$

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3 years ago

The mean of a population being sampled is 64, and the standard deviation is 6. If the sample size is 50, the standard error of t

Serjik [45]

Given:
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Standard error of the sample mean = standard deviation / √sample size

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3 years ago

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