3 years ago

How many classes have between 27 and 31 students?

Mathematics

1 answer:

bekas [8.4K]3 years ago

5 0

I’m not sure but I think 4 classes have between 27 and 31 students

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One day, a person went to a horse racing area. Instead of counting the number of humans an horses, he conuted 74 heads and 196 l

DerKrebs [107]

Data:

Humans (x) = 2 Legs
Horses (y) = 4 Legs

74 Heads
196 Legs

Solving:

Addition method

$\left \{ {{x + y =74} \atop {2x + 4y =196}} \right.$

Simplify by (-4) The first equation

$\left \{ {{x + y =74(-4)} \atop {2x + 4y =196}} \right.$
$\left \{ {{-4x - \diagup\!\!\!\!\!4y =-296} \atop {2x + \diagup\!\!\!\!\!4y =196}} \right.$
$\left \{ {{-4x =-296} \atop {2y =196}} \right.$
$-2x = -100.simplify(-1)$
$2x = 100$
$x = \frac{100}{2}$
$\boxed{x = 50}$

Now, to find the number of horses, I will use the following equation and I will replace the found value, we will have:

$x + y = 74$
$50+y = 74$

Number with incognito are to the left of the equality and numbers without incognito are to the right, remembering that when changing of side changes the signal.

$y = 74-50$
$\boxed{y = 24}$

Answer:
Humans = 50
Horses = 24

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3 years ago

Which expression is equivalent to 3 x 5x5x5x5x5 x 5? 156 157 3(5) 6 3(5)?

kotykmax [81]

Answer:

3(5^6)

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

2(3x - 6) + 5x = -x-4(7-1x) Need answers now

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