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Nana76 [90]
3 years ago
7

(If this question is easy, I am just horrible with percentages, lol :p)

Mathematics
1 answer:
Sati [7]3 years ago
5 0
55% of 20 is 11. the answer is 20
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. If there are 20 girls in a class of 30 students, find out the percentage of boys in the class?​
Katena32 [7]

Answer:

10

Step-by-step explanation:

because there are 20 girls and 10 boys = 30

4 0
2 years ago
Read 2 more answers
URGENT will give brilliant mark For the reaction 2Na + Cl2 ------ 2NaCl, how many grams of sodium chloride can be produced from
SVETLANKA909090 [29]

Answer:

825 g

Step-by-step explanation:

Here's my work:

500g Cl2 l   1mol Cl2  l  2 mol NaCl   l  58.5 g NaCl

                l   71 g Cl2    l  1 mol Cl2      l    1 mol NaCl  

= 823.94  - the rounding can be a little off

The first thing you have to do is convert the 500 g of Cl2 into moles.  So you get the mass of Cl which is 35.5, but Cl is diatomic by itself so you multiply 35.5 x 2 and get 71.   now on the third column you are comparing the mol ratios of the equation.  The equation is 2Na + Cl2 ---> 2NaCl, so you see that there is no coefficient in front of Cl2 so that means there is 1 mol, and then you see that in the product there is a  coefficient of 2 in front of NaCl so that means there is 2 moles.  Then finally you have to convert the moles backs into grams where you just add the masses of Na and Cl .  You multiply across the top  and then divide that number by the bottom row.

6 0
2 years ago
Help with this question
Morgarella [4.7K]

Answer:

C) (x-3)(x+3)

Note:

Just a tip there is an app called Desmos where you can put in equations like this and it will graph them for you.

7 0
3 years ago
Someone please help me
Lerok [7]

Answer:

y=3x+5

Step-by-step explanation:

I think that this is what they mean...

y=mx+b

y=3x+b

y=3x+5

plug in #s

5=15+5

5=20 no

6 0
3 years ago
PLEASE HELP THIS IS EASY BUT IM JUST BAD AT MATH
balandron [24]

Answer:

Its B

Step-by-step explanation:

Try and read throught it slowly and everytime you hit a variable go down the the answer and find where it is. That helped me a lot

5 0
3 years ago
Read 2 more answers
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