I am so confused on functions! Please help!

1 answer:

4 0

Functions are basically another way of expressing a way to get y or x or anything (mostly used for graphs) You will see functions like f(x)= 23y-5 (that was made up). Basically the number in the parenthesis in front of the f is what you're finding. So the equation after the equal sign is how to find whatever is being found. So in this case, finding x can be pretty easy. By the way, when graphing this you have x as the run and y as the rise.

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Guys i need these answers badly so i would appreciate if someone responded Thanks !

nikdorinn [45]

Answer:

Y is the midpoint of XZ, so XY = YZ

20x - 30 = 12x + 10
20x - 12x = 10 + 30
8x = 40
x = 5

Find XZ:

XZ = 2(XY) = 2(20*5 - 30) = 140

The answer is:

x = 5 and XZ = 140

------------------------

B is the midpoint of AC, so AB = BC

4x + 3 = 2x + 15
4x - 2x = 15 - 3
2x = 12
x = 6

Find AC:

AC = 2(AB) = 2(4*6 + 3) = 54

The answer is:

x = 6, AC = 54

3 0

3 years ago

Make a the subject of: b=(a-3)²

natka813 [3]

$\sqrt{b+3}=a$

b = (a - 3)²

Our aim is to get a to be alone

1) First we get rid of what's in the brackets. So we subtracts each side by 3. Of course, the opposite of subtracting is adding:

b+3 = a²

2) Now we get rid of the squared in a. Opposite of squaring is square rooting.

$\sqrt{b+3} =a$

3) There we have it. a is now by itself. We can test if we're right by substituting.

Lets make a=2

b=(a-3)²

b= (2-3)²

b= 1

NOW:

$\sqrt{b+3} =a$

$\sqrt{1+3} =2$

4 0

3 years ago

A zip line starts 35 feet above the ground and has one landing platform. The line is secured into the ground

max2010maxim [7]

The complete question in the attached figure

we know that

(35)/(40.5+54)=x/54-------- > (35)/(94.5)=x/54---------> x=(54)*(35)/(94.5)

X=20 ft

the answer is 20 ft