pamela vendio 3 chocolates de 14 g cada uno y obtuvo una ganancia de $21. Si quiere ganar $400 mediante la venta de 20 chocolates ¿cuantos gramos debe de pesar cada chocolate?

Correct option: first one -> 40

Step-by-step explanation:

To solve this problem, we can use a compound rule of three.

The quantity of chocolate and the weight of each chocolate are inversely proportional: to achieve the same earning, if we have more chocolate, we need less grams per chocolate.

Then, the rate of change in quantity multiplied by the rate of change in the grams will be equal to the rate of change in the final earning.

So we have that:

(3/20) * (14/X) = 21/400

42 / 20X = 21 / 400

1 / 10X = 1 / 400

10X = 400

X = 40 grams

Correct option: first one

step-by-step explanation:

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is           symmetric about the line y = 120,000.

step-by-step explanation:

given that megan owns a clothing boutique.

the profits of 2010, 11, are recorded and shown as follows:

years since     2010 0     1     2     3       4       5

profits made in 1000's   39       84     111     120   111     84

we find that profit gradually increases form 2010 to 2013 upto 120,   then starts decreasing.

the profits for 2012 and 2014 are the same while that of 2011 and 2015 are also the same.

this shows that there is symmetry about the line profit = 120000

hence answer is:

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is           symmetric about the line y = 120,000.

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i believe it is c.y = 9x

rise over run. 9 units up over 1 unit right or 9/1