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Gelneren [198K]
3 years ago
6

The mean height of 10 girls is 154cm. The mean height of 8 boys is 162cm. What is the mean height of the class?

Mathematics
1 answer:
olganol [36]3 years ago
8 0

Answer:

158cm

Step-by-step explanation:

154+162=316

316/2=158

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Hope someone can help me with this
Norma-Jean [14]
Hi,

To find the volume of cylinder this formula is required.

v = \pi {r}^{2} h

To get radius you need to divide diameter with 2 like this.

80 \div 2 = 40

Now just put your values into formula.

v = \pi {40}^{2}  \times 130 \\ v =653451.27

You will need 653451.27 cubic centimetres of concrete.

Hope this helps.
r3t40
7 0
3 years ago
Someone please help. Please explain how I should do it!
Ede4ka [16]

Answer:

Step-by-step explanation:

if m and n are irrational number then the product of mn sometimes rational and sometime irrational

ex: √5 *√2=√10 irrational

ex: √8*√2=√16=4 rational

b-y=|x|+3

explain why |x|+3≥|x+3|

absolute value of any number is always positive

x           |x|+3          ≥            |x+3|

1              4              =               4             in this case equal

2             5                                5

-2             5             ≥                 1             in this case |x|+3≥|x+3|

in case of negative value of x then |x|+3>|x+3|

7 0
3 years ago
ZA and ZB are vertical angles. If mZA= (5x – 4) and mZB = (2x – 1)º, then find the value of x. INI​
natulia [17]

Answer:

x = 1

Step-by-step explanation:

It is given that,

∠A and ∠B are vertical angles.

∠A = (5x – 4) and ∠B = (2x – 1)

We need to find the value of x.

We know that, the vertical angles are equal. So,

∠A=∠B

(5x – 4)=(2x – 1)

Taking like terms together,

5x-2x = 4-1

3x=3

x = 1

So, the value of x is equal to 1.

4 0
3 years ago
50 points!! Help needed
babunello [35]

Answer:

1) Enlargement

2) Reduction

Step-by-step explanation:

Question 1

200% means double, a factor 2

a) 2(2.5) = 5 inches

it's an enlargement

b) 2(original) = new/on the page

Question 2

a) 0.6(24) = 14.4 inches

Reduction

b) 0.6(original) = new/sketch

4 0
4 years ago
Read 2 more answers
3(4x-9)&gt;=2x+12<br> &gt;= is greater than equal to
ValentinkaMS [17]
12x-27=2x+12
10x-27=12
10x=39
x=3.9
5 0
3 years ago
Read 2 more answers
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