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weqwewe [10]
2 years ago
8

Find the circumference and the area of a circle with radius 9 .

Mathematics
1 answer:
Eduardwww [97]2 years ago
6 0
C=2(pi)r use this equation with 9 in place of r
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What is the equation of the line that passes through (-3, -1) and has a slope of 2/5 ? Put your answer in slope-intercept form.
Scrat [10]

Answer:

  a.  y = 2/5x + 1/5

Step-by-step explanation:

In point-slope form, the equation of a line with slope m through point (h, k) can be written

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Then a line with slope 2/5 through the point (-3, -1) will have point-slope equation ...

  y = (2/5)(x +3) -1

This can be simplified to the desired form:

  y = 2/5x +6/5 -1 . . . . . . eliminate parentheses; next, collect terms

  y = 2/5x + 1/5

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3 years ago
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What is the exact solution to the equation 2^2x=5^x−1 ?
Ann [662]

2^2x=5^x−1

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ln(2^2x) = ln(5^x-1)

Expand the logs by pulling the exponents out:

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Simpligy the right side:

2xln(2) = ln(5)x - ln(5)

Now solve for x:

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2xln(2) - ln(5)x = -ln(5)

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Divide both sides by (2ln(2) - ln(5))

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Answer:

the third angle= 180-x-(4x+15)

Step-by-step explanation:

if we subtract the two other angles the result will be the measure of the last one

4 0
3 years ago
Whats the circumference of a circle with a radius of 21 meters
Bogdan [553]

Answer:

C =131.88 meters

Step-by-step explanation:

The circumference of a circle is given by

C = 2*pi*r

where r is the radius

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C = 42 pi

If we approximate pi by 3.14

C = 42(3.14)

C =131.88 meters

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