Una caixa plena de raim pesa 21 kilos. Si el raim que hi ha pesa 19 quilo, quant pesa la caixa buida

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Pregunta completa

Una caixa plena de raïm pesa 21 quilos. Si el raïm d’allà pesa 1.9 quilos, quant pesa la caixa buida

7.6 quilograms

Step-by-step explanation:

Pas 1

Convertim el pes de la caixa completa de raïm a quilograms

1 lliura = 0.454 quilograms

21 lliures = x

Creu Multiplicar

x = 21 × 0.454 quilograms

x = 9.52544 quilograms

Aproximadament 9.5 quilograms

Ens van dir que el raïm d’allà pesava 1.9 quilos,

Per tant, el pes de la caixa buida és

= 9.5 - 1.9

= 7.6 quilograms

El pes de la caixa buida és de 7.6 quilograms

the 4th choice is the correct one

step-by-step explanation:

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1