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Maru [420]
2 years ago
15

This is a substitution problem

Mathematics
2 answers:
mrs_skeptik [129]2 years ago
6 0

They consists of equations and unknown variables. There are 4 PCs and 8 Mac in the room

<h3>System of equation</h3>

They consists of equations and unknown variables

Let the number of PCs be x

Let the number of Mac be y

If Mke has 12 computers, then;

x + y = 12

If there are two Macs for every PC in his classroom, then;

y = 2x

Substitute

x + 2x = 12

3x = 12

x = 4

Recall y = 2x

y = 2(4)

y = 8

There are 4 PCs and 8 Mac in the room

Learn more on system of equations here; brainly.com/question/14323743

#SPJ2

Ivanshal [37]2 years ago
6 0

Answer:4 PCs and 8 Macs

Step-by-step explanation:

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Rina8888 [55]

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<h3>Properties of a square.</h3>
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Using Pythagoras theorem the value of x can be found as follows:

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topjm [15]

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7 0
2 years ago
Tom throws a ball into the air. The ball travels on a parabolic path represented by the equation , where represents the height o
tigry1 [53]

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2.5 second

Step-by-step explanation:

The equation is missing in the question.

The equation is,  h=-8t^2+40t  , where 'h' is the height and 't' is time measured in second.

Now we know to reach its maximum height, h in t seconds, the derivative of h with respect to time t is given by :

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Now the differentiating the equation with respect to time t, we get

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\frac{dh}{dt}=-16t+40

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So, -16t+40=0

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\Rightarrrow t = 2.5

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