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3 years ago

Help me please ASAP, thanks!

Mathematics

1 answer:

Assoli18 [71]3 years ago

8 0

Answer:

Step-by-step explanation:

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What is the radius of a circle with the equation x2 + y2 – 14x + 10y = 250?

ololo11 [35]

X2 + y2 - 14x + 10y = 250
x2 -14x + 49 - 49 + y2 + 10x + 25 - 25 = 250
(x - 7)^2 - 49 + (y+5)^2 - 25 = 250
(x-7)^2 + (y+5)^2 = 250 + 49 + 25
(x-7)^2 + (y+5)^2 = 324

Therefore the radius, r
r = 324^0.5
r = 18

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3 years ago

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0, 1, 2

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3 years ago

In a lab, a substance was cooked by 42 C over a period of 7 hours at a constant rate. What was the change in temperature each ho

Mekhanik [1.2K]

Given that we have the change in temperature over 7 hours and we are looking for the change over 1 hour, we can divide the total change in temperature by 7. Thus, the change in temperature would be $\frac{42}{7} C^{\circ}$ .

Additionally, this can be solved by equations:

$\dfrac{42 \,\textrm{C}^{\circ}}{7 \,\textrm{hours}} = \dfrac{x \,\textrm{C}^{\circ}}{1 \,\textrm{hour}}$

$1 \,\textrm{hour} \cdot \dfrac{42 \,\textrm{C}^{\circ}}{7 \,\textrm{hours}} = x \,\textrm{C}^{\circ}$

$\dfrac{42}{7} \,\textrm{C}^{\circ} = x \,\textrm{C}^{\circ}$

$\dfrac{42}{7} = x$

By using two different methods, we can determine that the change each hour was equal to 42/7 C° per hour.

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3 years ago

Reuben is making a replica of the us flag for his school project. he uses a scale of 0.5 centimeter to 1 inch to draw the flag.

Alex777 [14]

The question above makes use of the concept of ratio and proportion in a form of scaling. If we let x and y be the true length and width, the equations that best describe them are,
0.5 cm / 1 inch = 2.5 cm / x in ; x = 5 in
0.5 cm / 1 inch = 4.75 cm / y in ; y = 9.5 in
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3 years ago

Read 2 more answers

A line passes through the points(-3,5) and (7,5) what type of slope does it have?

lions [1.4K]

Answer:

slope= 0

Step-by-step explanation:

slope (m)= 0/10= 0

the line belongs to a horizontal line, so the slope is 0

equation= y=5

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3 years ago