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3 years ago

PLEASE HELP!! 8TH/9TH GRADE MATH!!

Mathematics

2 answers:

a_sh-v [17]3 years ago

7 0

B 112 m/s; it represents the average speed of the object between 3 seconds and 5 seconds

Yuliya22 [10]3 years ago

3 0

(350-126)/(5-3)=112m/s

This is the average speed in the time from 3 to 5 seconds...

dd/dt 98,126,154
d2d/dt2 28,28

She actually had a constant acceleration over the entire time period.

The function for that table is:

d(t)=14t^2

Her actual velocity at any point is v(t)=28t (you can see that if you take the mid point of the interval, 4s, you will get the average velocity found earlier)

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Solve this <img src="https://tex.z-dn.net/?f=4%5Cleft%285x-2%5Cright%29%3D2%5Cleft%289x%2B3%5Cright%29" id="TexFormula1" ti

vampirchik [111]

Answer:

Solution of equation ( x ) = 7

Step-by-step explanation:

In this question we have given with an equation that is 4 ( 5x - 2 ) = 2 ( 9x + 3 ). And we are asked to solve this equation that means we have to find the value of x.

Solution : -

 $\quad \longrightarrow \: 4 ( 5x - 2 ) = 2 ( 9x + 3 )$ 

Step 1 : Removing parenthesis :

$\quad \longrightarrow \:20x - 8 = 18x + 6$

Step 2 : Adding 8 from both sides :

$\quad \longrightarrow \:20x - \cancel{ 8 }+ \cancel{8} = 18x + 6 + 8$

On further calculations we get :

$\quad \longrightarrow \:20x = 18x + 14$

Step 3 : Subtracting 18 from both sides :

$\quad \longrightarrow \:20x - 18x = \cancel{18x }+ 14 - \cancel{18}$

On further calculations we get :

$\quad \longrightarrow \:2x = 14$

Step 4 : Dividing with 2 on both sides :

$\quad \longrightarrow \: \frac{ \cancel{ 2}x}{ \cancel{2}} = \cancel{\frac{14}{2} }$

On further calculations we get :

$\quad \longrightarrow \: \blue{\boxed{ \frak{x = 7}}}$

Therefore, solution of this equation is 7 or we can say that value of this equation is 7 .

Verifying : -

We are verifying our answer by substituting value of x in given equation. So ,

4 ( 5x - 2 ) = 2 ( 9x + 3 )

4 [ 5 ( 7 ) - 2 ] = 2 [ 9 ( 7 ) + 3 ]

4 ( 35 - 2 ) = 2 ( 63 + 3 )

4 ( 33 ) = 2 ( 66 )

132 = 132

L.H.S = R.H.S

Hence, Verified.

Therefore, our value for x is correct .

<h2>#Keep Learning</h2>

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2 years ago

Read 2 more answers

What percent of 55 is 44?

shepuryov [24]

125% maybe i don’t know for sure

3 0

2 years ago

Consider the system of linear equations. 2y = x + 10 3y = 3x + 15

Art [367]

I hope this helps you

5 0

3 years ago

Expand and simplify: (x-5)(x+5)

stealth61 [152]

X^2-5x+5x-25 (multiply (x-5) with (x+5))
X^2-25 ( -5x+5x =0)

5 0

3 years ago

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Your boss gave you a raise. Your weekly salary went from $375 to $450. What was your percent raise?

Yuri [45]

1. Find the difference
2. Divide the difference by the original number it went up from.

450-375 = 75

75/375 = 0.2

You got a 20% raise.

Proof:
375*.2 = 75
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3 years ago