2 years ago

Tres y cuatro quintas partes de un numero es 36.

Mathematics

1 answer:

Aleks04 [339]2 years ago

4 0

Answer:

136.8

Step-by-step explanation:

The answer is 136.8 becuase 3 4/5 of 36 is 136.8

P.S Can I have brainliest?

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3 years ago

What is 1/2 times 2 times 1.7

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1.7

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3 years ago

An open box is to be constructed so that the length of the base is 3 times larger than the width of the base. If the cost to con

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Answer:

Step-by-step explanation:

Let assume that the volume = 88 cubic feet

Then:

$L = 3w --- (1)volume = l \times w \times h \\ \\ 88 = (3w) \times w \times h \\ \\ 3w^2 h= 88 \\ \\ h = \dfrac{88}{3w^2}--- (2) \\ \\$

The construction cost now is:

$C = 4(l \times w) + 2 ( w \times h) + 2(l \times h) \\ \\ C = 4(3w^2) + 2(w \times \dfrac{88}{3w^2}) + 2(3w \times \dfrac{88}{3w^2}) \\\\ C = 12w^2 + \dfrac{176}{3w} + \dfrac{176}{w}$

Now, to determine the minimum cost:

$\dfrac{dC}{dw}= 0 \\ \\ \implies 24 w - \dfrac{176}{3w^2}- \dfrac{176}{w^2}=0 \\ \\ 24 w ^3 = \dfrac{176}{w^2}(\dfrac{1}{3}+1) \\ \\ 24 w ^3 = \dfrac{176(4)}{3} \\ \\ w^3 = \dfrac{88}{3(3)}$