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Dennis_Churaev [7]

3 years ago

11

Find the area of a circle with diameter 18 ft Use the value 3.14 for pi, and do not round your answer. Be sure to include the co

rrect unit in your answer.

1 answer:

adelina 88 [10]3 years ago

3 0

Answer:

the area is 254.47

Step-by-step explanation:

A=pi sign r²

d=2r

now we solve for the area

A=1/4 pi sign d²=1/4 times 3.14 times 18=254.47

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llyssa and Mark conducted an experiment with two identical spinners that each contain 4 colors. They spun both spinners and reco

pychu [463]

Answer:

Step-by-step explanation:

Answer is a 2/25

7 0

3 years ago

A student solved a system of equations by elimination. Describe and correct the error made in the part of the solution shown.

ivanzaharov [21]

Answer:

x = -2; y = 3

Step-by-step explanation:

5x + 4y = 2 (1)

3x + 3y = 3 (2)

Multiply (1) by 3 and (2) by 4

15x + 12y = 6 (3)

12x + 12y = 12 (4)

Subtract (4) from (3)

15x - 12x = 6 - 12

3x = -6

x = -6/3

x = -2

Substitute x = -2 into (1)

5x + 4y = 2

5(-2) + 4y = 2

-10 + 4y = 2

4y = 2 +10

4y = 12

y = 12/4

y = 3

The first error is when he multiplied equation (2) by 4

He didn't multiply the right hand side of the equation by 4

3x + 3y = 3 ×4

12x + 12y = 12

But he wrote

12x + 12y = 3

The the next error is subtracting the left hand side of the equation and adding the right hand side

15x + 12y = 6

12x + 12y = 3

He wrote

3x = 9

Instead of 3x = 3

7 0

3 years ago

When graphed in the (x,y) coordinate plane, at what point do the lines x - y = 12

Alex17521 [72]

Answer:

(14, 2).

Step-by-step explanation:

x - y = 12

y = 2

Solving this system:

Plug y = 2 into the first equation:

x - 2 = 12

x = 14.

Therefore the point of intersection is at (14, 2).

4 0

3 years ago

Simplify 7h^2+6h^2+5h^2+6h^2-h^2

iogann1982 [59]

Answer:

23h^2

Step-by-step explanation:

These are all like terms so we add/subtract them from left to right.

7h^2+6h^2+5h^2+6h^2-h^2

= 24h^2 - h^2

= 23h^2 (answer)

6 0

2 years ago

Log14/3 +log11/5-log22/15=log

Tamiku [17]

Answer:

$log7$

Step-by-step explanation:

when adding logs, apply the log rule: $\log _a\left(x\right)+\log _a\left(y\right)=\log _a\left(xy\right)$

∴ $\log\left(\frac{14}{3}\right)+\log\left(\frac{11}{5}\right)=\log\left(\frac{14}{3}\cdot \frac{11}{5}\right)$

when subtracting logs, apply the log rule: $\log _a\left(x\right)\:-\:\log _a\left(y\right)=\log _a\left(\frac{x}{y}\right)$

$\log\left(\frac{14}{3}\cdot \frac{11}{5}\right)-\log\left(\frac{22}{15}\right)=\log\left(\frac{\frac{14}{3}\cdot \frac{11}{5}}{\frac{22}{15}}\right)\\\\=\log\left(7\right)$

5 0

2 years ago

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