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2 years ago

Can someone help me please? :(

Mathematics

1 answer:

AlexFokin [52]2 years ago

7 0

Answer:

X = 3

3 x 3 x 3 = 27

27 - 3 =24

Hope this helps!

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35,600 is 8.3% of what number

Over [174]

This question can be solved by:
$\frac{8.3}{100} = \frac{35,600}{x}$

Cross multiply to get: 8.3x = 3,560,000

To let the x stand along (since you are finding the x value), divide 8.3 to both sides of the equal sign.

$\frac{8.3x}{8.3} = \frac{3560000}{8.3}$

Simplify to get the answer.

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3 years ago

Change in v =9.8m/s 2 times t

Kitty [74]

Answer:

v = 39.2 m/s

Step-by-step explanation:

They gave you the equation for velocity during freefall in picture2 as:

v = 9.8t m/s

they ask you what the value of v (velocity) is after t=4 sec.

Just plug in t=4 into the equation.

v = 9.8t

v = 9.8(4)

v = 39.2 m/s

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2 years ago

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Answer:

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Step-by-step explanation:

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3 years ago

A student answered 140 questions correctly out of 200. What percent is this?

charle [14.2K]

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3 years ago

Solve the system by substitution. y = -4x 23 - 5y = 44

spin [16.1K]

<h3>Explanation</h3>

Given the system of equations.

$\begin{cases} y = - 4x \\ 23 - 5y = 44 \end{cases}$

Substitute y = -4x in the second equation.

$23 - 5( - 4x) = 44 \\ 23 + 20x = 44 \\ 20x = 44 - 23 \\ 20x = 21 \\ x = \frac{21}{20}$

Substitute the value of x in any given equations. I will substitute the value of x in the first equation.

$y = - 4x \Longrightarrow y = - 4( \frac{21}{20} ) \\ y = \cancel{ - 4}( \frac{21}{ \cancel{20}} ) \Longrightarrow y = - \frac{21}{5} \\ y = - \frac{21}{5}$

Answer Check by substituting both values in two equations.

First Equation

$y = - 4x \Longrightarrow - \frac{21}{5} = - 4( \frac{21}{20} ) \\ - \frac{21}{5} = \cancel{ - 4}( \frac{21}{ \cancel{20}} ) \\ - \frac{21}{5} = - \frac{21}{5} \: \: \: \checkmark$

Second Equation

$23 - 5y = 44 \\ 23 - 5( - \frac{21}{5} ) = 44 \\23 - \cancel{5}( - \frac{21}{ \cancel{5}} ) = 44 \\ 23 + 21 = 44 \\ 44 = 44 \: \: \: \: \checkmark$

Both equations are true for the value of x and value of y.

<h3>Answer</h3>

 $\begin{cases} x = \frac{21}{20} \\ y = - \frac{21}{5} \end{cases}$ 

Coordinate Point form

$( \frac{21}{20} , - \frac{21}{5} )$

5 0

3 years ago