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3 years ago

I need help please someone

Mathematics

1 answer:

ohaa [14]3 years ago

6 0

Answer:

y = 4x + 5

To find the slope do :

21 - (-3)

4 -(-2)

That will equal :

24 simplified : 4

Take your slope and one of the points and plug it into y = mx + b

That will look like: (21) = 4(4) + b

21 = 16 + b

Subtract 16 -16 -16

on both sides

This is your y-int: 5 = b

Put the slope and y-int into the equation

And this is your answer: y = 4x + 5

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The height H of an ball that is thrown straight upward from an initial position 3 feet off the ground with initial velocity of 9

mariarad [96]

Answer:

The ball will be 84 feet above the ground 1.125 seconds and 4.5 seconds after launch.

Step-by-step explanation:

Statement is incorrect. Correct form is presented below:

The height $h(t)$ of an ball that is thrown straight upward from an initial position 3 feet off the ground with initial velocity of 90 feet per second is given by equation $h(t) = 3 +90\cdot t -16\cdot t^{2}$ , where $t$ is time in seconds. After how many seconds will the ball be 84 feet above the ground.

We equalize the kinematic formula to 84 feet and solve the resulting second-order polynomial by Quadratic Formula to determine the instants associated with such height:

$3+90\cdot t -16\cdot t^{2} = 84$

$16\cdot t^{2}-90\cdot t +81 = 0$ (1)

By Quadratic Formula:

$t_{1,2} = \frac{90\pm \sqrt{(-90)^{2}-4\cdot (16)\cdot (81)}}{2\cdot (16)}$

$t_{1} = 4.5\,s$ , $t_{2} = 1.125\,s$

The ball will be 84 feet above the ground 1.125 seconds and 4.5 seconds after launch.

3 0

2 years ago

Can someone please help me on this question? This question has 2 answer choices. Thank you.

grin007 [14]

Hello!

To solve this you have to find the ratio between the two cylinders

Cylinder 1 height is 30
Cylinder 2 height is 20

this is a 30:20 ratio

This can be reduced to a 3:2 ratio

Now you look for one that are also equal to 3:2

3 * 7 = 21
2 * 7 = 14

The answers are 3:2 and 21:14

Hope this helps!

4 0

2 years ago

Please help me with this!

Verizon [17]

Answer:

i think it has 4

Step-by-step explanation:

t + 15 is something on money

6 0

2 years ago

Solve for x. −23(3x−4)+3x=56

labwork [276]

Answer:

x = 6/11

Step-by-step explanation:

−23(3x−4)+3x=56

Distribute

-69x + 92 +3x = 56

Combine like terms

-66x+92 = 56

Subtract 92 from each side

-66x+92-92 = 56-92

-66x =-36

Divide each side by -66

-66x/-66 = -36/-66

x = 6/11

7 0

2 years ago

The image of a point after a –90° rotation about the origin is (–4, 7). What are the coordinates of the preimage?.

ahrayia [7]

The coordinated of the preimage would be :

x = x cos θ + y sin θ

y = x sin θ + y cos θ

where

x = -4
y = 7
θ = -90

hope this helps

4 0

3 years ago