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3 years ago

In a class of 32 students

Mathematics

1 answer:

Veseljchak [2.6K]3 years ago

6 0

Answer:

1.48 m

Step-by-step explanation:

In a class of 32 students

the mean height of the 14 boys is 1.56 meters.

the mean height of all 32 students is 1.515 meters.

Total number of students = 32

Mean height of all students = 1.515

We can obtain the sum of all student's height :

Number if students * mean height

= 32 * 1.515

= 48.48

Number of boys = 14

Mean height of boys = 1.56m

We can obtain the sum of all boys height :

Number if students * mean height

= 14 * 1.56

= 21.84

Number of girls :

All students - Number of boys

32 - 14 = 18

Sum of girls height :

48.48 - 21.84 = 26.64

Mean height of girls :

Sum of girls height / Number of girls

26.64 / 18

= 1.48 m

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(7x²+2x+5)+(3x²-8x-10)

Mariulka [41]

First you would simplify the equation (7x²+2x+5)+(3x²-8x-10) lets start with the first part
(7x²+2x+5)
7x² + 2x which = 49x + 2x which also = 51x Then you add the last part (+5)
51x + 5
Now you simplify the last part.
(3x²-8x-10)
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3 years ago

Charles is 19 years old. his grandfather is 67 years older than he. what was thee total age 9 years ago?

almond37 [142]

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3 years ago

Read 2 more answers

2 thousands 7 tens divided by 10 equal

Shkiper50 [21]

The answer is 207 or 2 hundreds 7 ones in unit form or two hundred seven in word form.

<h3>Further explanation</h3>

2 thousands 7 tens are a unit form. The standard form is 2,070.

Explanations and an example of questions about the four types of number forms can be found at brainly.com/question/4725342.

The key problem is working out the value of 90,000 divide by 10. This is a division operation.

$\boxed{2,070 \div 10 = ?}$

Option-1

Both numbers are divided by 10.

$\boxed{2,070 \div 10 = 207 \div 1}$

The result is

$\boxed{2,070 \div 10 = 207}$

Option-2

Division operations can be written as fractions, like this.

$\boxed{\frac{2,070}{10} = ?}$

The numerator and denominator are both divided by 10, or 'cross out a zero from both'.

$\boxed{\frac{207}{1} = ?}$

The result is

$\boxed{2,070 \div 10 = 207}$

- - - - - - -

If x is divided by y equals z, then x is equal to y multiplied by z.

$\boxed{If \ x \div y = z \ or \ \frac{x}{y} = z, then \ x= y \times z}$

Let's prove it!

$\boxed{If \ 2,070 \div 10 = 207 \ or \ \frac{2,070}{10} = 270, then \ 2,070 = 10 \times 207}$

This is proven.

<h3>Learn more</h3>

Explanations and an example of a question about the four types of number brainly.com/question/4725342
5000 is ¹/₁₀ of what? brainly.com/question/106300
9 ten thousands divided by ten? brainly.com/question/545132

Keywords: 2 thousands 7 tens divided by 10, division operation, unit form, standard form, fractions, cross out a zero, the numerator and denominator