Question

Evaluate the following expression using the values given:
Find 4x - y - 2z if x = -2, y = 3, and z = -2

HELP HELP HELP

Answer 1

@ganeshie8

Answer 2

@Hero

Answer 3

@HWBUSTER00

Answer 4

@dan815

Answer 5

@dan815

Answer 6

@princeharryyy

Answer 7

@PrinceKel

Answer 8

@Michele_Laino

Answer 9

@Nnesha

Answer 10

Just substitute the numbers given to you into the equation.

Answer 11

\[4(-2)-(3)-2(-2)\]

Answer 12

TY IS -7

Answer 13

ITs##

Answer 14

can you help with another

Answer 15

The radius of a cone-shaped tank is 4 feet less than its height. If the height of the tank is (x - 3) feet, the expression below shows the volume of the tank:

1 over 3π(x - 7)2 (x - 3)

What does the factor π (x - 7)2 represent?

Answer 16

u have no clue'

Answer 17

i

Answer 18

Radius is 4 less than the height... write that as it reads, 'is' means equals

r = h - 4

Answer 19

Height is (x-3)

h = x - 3

Answer 20

The total surface area of the tank
The area of the curved sides of the tank
The area of the circular base of the tank
The area of the base of about three such tanks

Answer 21

so would it be the 3ed one

Answer 22

The volume of a Cone is
\[V = \frac{ 1 }{ 3 }\pi*r^2*h\]

Answer 23

insert in the values and solve

Answer 24

The radius is measured from the wide base of the cone

Answer 25

oh ok so d

Answer 26

If the radius is height minus 4
and the height is x - 3

r = h - 4
h = x - 3

sub in h for the radius

r = (x-3) - 4 = x - 7

Answer 27

They want to know what pi*(x-7)^2 represents...

in other words now that you have r = x - 7

the question is , what is

pi*r^2

Answer 28

you lost me

Answer 29

ok, the givens in the problem are,

r = h -4 (radius is 4 less than height)
h = x - 3 (height is x - 3

Answer 30

you get that part?

Answer 31

yea

Answer 32

To combine those two, you can take the h = x - 3, and insert that into the radius

r = h - 4 = (x-3) - 4
r = x - 7

so the radius is in terms of X now, not the height

Answer 33

good?

Answer 34

no

Answer 35

The radius is given in terms of the height of the cone... the height is given in terms of a measurememt X... is is one of those compound functions like..

r [ h(x)]

You use the height value in the radius , to get r(x), the radius in terms of the measure X instead of height h

Answer 36

i understand but What does the factor π (x - 7)2 represent

Answer 37

i understand how you solved it but how doo i answer the question

Answer 38

The volume of a cone is \[V = \frac{ 1 }{ 3 }\pi*r^2*h\]

Answer 39

recall, the area of a circle is A = pi*r^2

So the Volume of the cone is, 1/3 * ( area of circle base) * (height)

Answer 40

yea ok

Answer 41

pi times the radius squared is the area of the base in this instance

Answer 42

so its c

Answer 43

like i said

Answer 44

\[V = \frac{ 1 }{ 3 }\pi*r^2*h = (area ~base)*\frac{ height }{ 3 }\]

Answer 45

i didnt look at the answers

Answer 46

The total surface area of the tank
The area of the curved sides of the tank
The area of the circular base of the tank
The area of the base of about three such tanks

Answer 47

i understand the problem no but i wanted to clarify

Answer 48

a, right on, yeah C

Answer 49

tytytytytyty so much