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3 years ago

Evaluate the following expression when x = 3 and y = 4:

Mathematics

2 answers:

Alenkinab [10]3 years ago

7 0

Answer:

The answer is 14.6

Step-by-step explanation:

3^2+4^3/2+3

=9+64/5

=73/5

=14.6

Therefore the answer is

14.6

I hope that this has satisfied you.

Zigmanuir [339]3 years ago

4 0

The correct answer is 14.6

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mojhsa [17]

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—>28x=140
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3 years ago

Of 560 marbles in a bag, 65% are red and the rest are blue. After 28 red marbles are replaced with blue ones, how many blue marb

jonny [76]

Answer: The answer is 400 blue marbles.

Step-by-step explanation: Given that there are 560 marbles in a bag, out of which 65% are red and rest are blue.

So, number of red marbles is

$n_r=65\%\times 560=\dfrac{65}{100}\times 560=364,$

and number of blue marbles is

$n_b=560-364=196.$

Now, if 28 red marbles are replaced by blue marbles, the the new number of red and blue marbles will be

$n_r^\prime=364-28=336~~~\textup{and}~~~n_b^\prime=196+28=224.$

Now, to get 65% of the marbles blue, we need to add some more blue marbles to the bag. Let 'x' number of blue marbles are added to the bag, then

$65\%\times (560+x)=224+x\\\\\Rightarrow \dfrac{65}{100}\times (560+x)=224+x\\\\\Rightarrow 13(560+x)=20(224+x)\\\\\Rightarrow 7280+13x=4480+20x\\\\\Rightarrow 7x=2800\\\\\Rightarrow x=400.$

Thus, 400 blue marbles need to be added to the bag.

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3 years ago

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Solve the equation 3(x+2)=5(x-2)

Sladkaya [172]

Answer:

3( x + 2 ). = 5( x - 2)

3x + 6 = 5x - 10

-2x = - 16 

minus,minus cancel

x = 16/2 

x = 8 

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Step-by-step explanation:

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Taking pi=3.142, Diameter=12

Circ=3.142*12=37.704

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AnnyKZ [126]

Answer:11

Step-by-step explanation:

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