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pav-90 [236]
3 years ago
15

At Home Depot, Johnny bought 3 rose bushes and 7 flats of petunias for a total of

Mathematics
1 answer:
vitfil [10]3 years ago
4 0

Answer:

Step-by-step explanation:

At Home Depot, Johnny bought 3 rose bushes and 7 flats of petunias for a total of  $114.75.

Let x = rose bushes

Let y = petunias

This means;

3x + 7y = 114.75 ..... (i)

Rosie bought 2 rose bushes and 6 flats of petunias for a total of $89.50.

2x + 6y = 89.50 ..... (ii)

How  much does a rose bush cost? How much does a flat of petunias cost?

Multiply eqn (i) by 2 and eqn (ii) by 3.

This results too;

6x + 14y = 229.5 .... (iii)

6x + 18y = 268.5 .....(iv)

Subtract eqn (iii) from eqn (iv)

This results to;

4y = 39

y = 39 / 4 = $9.75

Subt the vale of y in eqn ii

2x = 89.50 - 6y

x = (89.50 - 6y) / 2

x = (89.50 - 6(39 / 4)) / 2

x = 31 / 2 = $15.5

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Select the correct answer from each drop-down menu.
serious [3.7K]

Answer:

Center: (4,8)

Radius: 2.5

Equation: (x-4)^2+(y-8)^2=6.25

Step-by-step explanation:

It was given that; the endpoints of the longest chord on a circle are (4, 5.5) and (4, 10.5).

Note that the longest chord is the diameter;

The midpoint of the ends of the diameter gives us the center;

Use the midpoint formula;

(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2} )

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To find the radius, use the distance formula to find the distance from the center to one of the endpoints.

The distance formula is;

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(x-4)^2+(y-8)^2=2.5^2

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