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2 years ago

10

Which equation represents a line that passes through (2 -1/2) and has a slope of 4

1 answer:

maksim [4K]2 years ago

3 0

Answer:

y + 1/2 = 4(x - 2)

Step-by-step explanation:

Use the point-slope equation y - k = m(x - h).

Inserting the given info, we get y + 1/2 = 4(x - 2)

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Help please and thanks! I'll award brainliest if you show your work as well :)

iren2701 [21]

Answer:

6 inches

Step-by-step explanation:

Formula for surface area of a cylinder:

$SA=2\pi r^{2} +2\pi rh$

Plug in values and solve for the radius:

$180\pi =2\pi r^{2} +2\pi r(9)\\$

Divide both sides by $2\pi$

$90=r^{2} +r(9)$

Subtract 90 from both sides

$0=r^{2} +9r-90$

Use the quadratic equation to find the roots

$x=(-b$ ± $\sqrt{b^2-4ac})*\frac{1}{2a}$ (sorry for formatting, Brainly doesn't

allow equations with ± in them)

$x=\frac{-9+\sqrt{9^2-4*1*90} }{2(1)}$ and $x=\frac{-9-\sqrt{9^2-4*1*90} }{2(1)}$

$x=\frac{(-9+\sqrt{81+360})}{2}$ and $x=\frac{(-9-\sqrt{81+360})}{2}$

$x=\frac{(-9+\sqrt{441})}{2}$ and $x=\frac{(-9-\sqrt{441})}{2}$

$x=\frac{(-9+21)}{2}$ and $x=\frac{(-9-21)}{2}$

$x=\frac{12}{2}$ and $x=\frac{-30}{2}$

$x=6$ and $x=-15$

We can't have a negative radius, so that leaves us with r=6 in.

8 0

2 years ago

Tickets to the concert were 2.50 for adults and 1.00 for students. 1,200 was collected and 750 tickets were sold.

Minchanka [31]

Answer:

I'm assuming you want to know the amount of child and adult tickets sold. 450 student tickets were sol, and 300 adult tickets.

Step-by-step explanation:

Solve for the first variable in one of the equations, then substitute the result into the other equation.

3 0

3 years ago

Which pair of angles must be supplementary? HURRYYYYY!

lisabon 2012 [21]

Answer:

1 and 3, if im wrong i am sorry I have not don this in a long time

Step-by-step explanation:

8 0

2 years ago

Read 2 more answers

the area of a circle is 96 square inches. What is the area of a circlewhose diameter is 1.5 times the diameter of the circle?

mars1129 [50]

The area of a circle A equals either:
πr² or πd²/4

96 = πd²/4 => d = 11 inches

The diameter of the second circle equals :
11*1.5 = 16.5 inches

The area equals: π(16.5)²/4 = 214 square inches

Good luck

5 0

3 years ago

Find the gcf of 12 and 45

krek1111 [17]

gcf = 3

the factors of 12 are 1, 2, 3, 4, 6 and 12

the factors of 45 are 1, 3, 5, 9, 15 and 45

the greatest common factor of 12 and 45 is 3

3 0

3 years ago

Read 2 more answers