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3 years ago

Which equation using x to represent time best represents the floor number of an elevator descending at a steady rate?

2 answers:

5 0

C. You'd be starting at a higher floor (positive number) and descending floors (negative number per x). If you assume x is time it's a little more logical and visual.

Xelga [282]3 years ago

3 0

Answer:

The correct option is c.

Step-by-step explanation:

The slope intercept of the function is

$y=mx+b$

where, m is slope and b is y-intercept of the line.

It is given that the floor number of an elevator descending at a steady rate. It means the value of m must be negative.

In option a and d the value of m is 2 which is a positive number. Therefore option a is and d are incorrect.

y represents the floor number and x represents the time. So, y-intercept represents the number of floor at initial stage.

The number of floor can not be a number, so the value of b must be positive.

In option b the value of b is -75 which is a negative number. Therefore option b is incorrect.

In option c the value of m is -2 which is a negative and b is 75 which is a positive number. Therefore option c is correct.

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the volume of a cube is increasing at a constant rate of 824 cubic centimeters per minute. At the instant when the volume of the

Maurinko [17]

Answer:

DA/dt = 75.27 cm²

Step-by-step explanation:

Cube Volume = V(c) = 683 cm³

DV(c) /dt = 824 cm³

V(c,x) = x³

Then

DV(c,x)/ dt = 3x² Dx/dt

( DV(c,x)/ dt )/ 3x² = Dx/dt (1)

Now as V(c,x) = x³ when V(c,x) = 683 cm³ x = ∛683

x = 8.806 ( from excel)

And by subtitution of this value in equation (1)

Dx/dt = ( DV(c,x)/ dt )/ 3x² ⇒ Dx/dt = 824 / 3*x²

Dx/dt = 824 /3*77.55

Dx/dt = 824/232,64

Dx/dt = 3,542

Then we got Dx/dt where x is cube edge. The area of the face is x² then

the rate of change of the suface area is

DA/dt = ( Dx/dt )²*6 ( 6 faces of a cube)

DA/dt = (3.542)²*6

DA/dt = 75.27 cm²

6 0

2 years ago

URGENT!! ILL GIVE

OverLord2011 [107]

If angle "a" measures 42° the the other angles that will be congruent to angle "a" and also measure 42° will be angle d, angle e and angle h .

In the question ,

a figure is given ,

From the figure we can see that 2 parallel lines are cut by a transversal .

So ,

angle a = angle d .......because vertically opposite angles .

angle a = angle e ...because corresponding angles are equal in measure

also

angle e = angle h .... because vertically opposite angles .

Therefore , If angle "a" measures 42° the the other angles that will be congruent to angle "a" and also measure 42° will be angle d, angle e and angle h , the correct option is (a) .

Learn more about Angles here

brainly.com/question/1597341

#SPJ1

4 0

1 year ago

Please help 22 points

disa [49]

Answer:

8/15

Step-by-step explanation:

4/5 x 2/3 = 8/15

4/5 x 2/3 = 0.5333