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3 years ago

Pleaseee helpppp:)))

Mathematics

1 answer:

matrenka [14]3 years ago

5 0

Answer:

<h2>Option B:</h2><h3>112 families </h3>

Step-by-step explanation:

Given,

No. of families = 75

Out of 75 no. of families had cars = 42

Out of 1, no. of families can have cars

$= \frac{42}{75}$

Therefore, 

Out of 200 families, no. of families had cars

$= 200 \times \frac{42}{75}$

$=200 \times \frac{14}{25}$

= 8 × 14

= 112

Hence, 

option B is correct as 112 families have cars out of 200 families (Ans)

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Andrej [43]

IdkAnswer:

Step-by-step explanation:

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3 years ago

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A box is to be made where the material for the sides and the lid cost $0.20 per square foot and the cost for the bottom is $0.

Reika [66]

Answer:

The dimension of the box is l×w×h = (2.274 × 2.274 × 1.934) ft³

Step-by-step explanation:

From the given information;

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We know that the volume of the box = 10 cubic feet

Then;

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For the four sides of the box now ;

= (0.2) 4a × 25/a²

= 0.8 × 25/a

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The total cost of the box is:

b = 0.65a² + 0.2a² + 20 /a

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Taking differential of b with respect to a ;we have:

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the cost for the base of the box =(0.65) × ( 2.274)²

the cost for the base of the box = 3.362

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The top of the box = (0.2)× ( 2.274)²

The top of the box = 1.034

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the volume of the box = 10 cubic feet

Then;

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4 years ago

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3 years ago

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3 years ago

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Answer:

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