1 year ago

The total marks obtained in a mathematics test was 384 if the mean was 24 how many children took the test

Mathematics

1 answer:

maks197457 [2]1 year ago

6 0

301 kids took the test

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Answer this question

Stells [14]

Answer:

$\huge\boxed{width=12cm}$

Step-by-step explanation:

$l-length\\w-width\\P-perimeter$

The formula of perimeter of the rectangle:

$P=2l+2w=2(l+w)$

Substitute:

$l=6w\\\\P=168cm$

$168=2(6w+w)\\168=2(7w)\\168=14w\qquad|\text{divide both sides by 14}\\\\\dfrac{168}{14}=\dfrac{14w}{14}\\\\12=w\Rightarrow w=12(cm)$

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2 years ago

Rewrite square root of -49 -4 in complex number notation please help

SVEN [57.7K]

Note that if $i^2=-1$ than $i=\sqrt{-1}$ ,

Also note that $\sqrt{ab}=\sqrt{a}\sqrt{b}$

So we have,

$\sqrt{-49}=\sqrt{-1}\sqrt{49}=\boxed{7i}$

and,

$\sqrt{-4}=\sqrt{-1}\sqrt{4}=\boxed{2i}$

Hope this helps.

r3t40

4 0

2 years ago

For which function is the domain -6 <img src="https://tex.z-dn.net/?f=%20%5Cleq%20" id="TexFormula1" title=" \leq " alt=" \leq "

anygoal [31]

$y = \sqrt{x}$ has only real solutions if x is not negative.

3 0

2 years ago

Judi is making a rope ladder. she uses 1/2 yard of rope for each step. how many steps can she make with 6 yards of rope?

ddd [48]

12 steps for this problem.

In reality a rope ladder is actually not just rope for the steps but ropes for the sides too

3 0

2 years ago

Read 2 more answers

How many times does 12 going to nine

Valentin [98]

Answer:

Not possible

Step-by-step explanation:

12×1=12

It's over 9.

3 0

2 years ago