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Sati [7]
3 years ago
5

Debi had $1.55 in a collection of dimes and nickels. The number of nickels is seven more than the number of dimes. Find the numb

er of each type of coin.
There are ___ dimes.
There are ___ nickels.
Mathematics
1 answer:
guapka [62]3 years ago
5 0

N =D+7

0.10D +0.05(D+7) = 1.55

0.15D +0.35 = 1.55

0.15D=1.20

D=120/0.15 = 8

8x0.10 = 0.80

1.55-0.80= 0.75

8+7=15 * 0.05 = 0.75

8 dimes and 15 nickels

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Step-by-step explanation:

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3 years ago
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lbvjy [14]

Answer:

The equation of the quadratic graph is f(x)= - (1/8) (x-3)^2 + 3 (second option)

Step-by-step explanation:

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Directrix: y=5 (horizontal line), then the axis of the parabola is vertical, and the equation has the form:

f(x)=[1 / (4p)] (x-h)^2+k

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The directix y=5 must intercept the axis of the parabola at the point (3,5), and the vertex is the midpoint between this point and the focus:

Vertex is the midpoint between (3,5) and (3,1):

h=(3+3)/2→h=6/2→h=3

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Replacing the values in the equation:

f(x)= [ 1 / (4(-2)) ] (x-3)^2 + 3

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3 years ago
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Let x be the number of pastries they must sell.

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Step-by-step explanation:

-39.75 = 7.5m

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3 years ago
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