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2r
2r + 7r - 6t - r + 7t = 8r + t
2r + 2s = 50 2r - s = 17 therefore 4r - 2s = 34 Add so that you can eliminate one of the variables: 2r + 2s = 50 4r - 2s = 34 ---------------- 6r + 0s = 84 Solve for r: 6r = 84 r = 14 Substitute r into one of the original equations: 2(14) + 2s = 50 28 + 2s = 50 2s = 22 s = 11 Doublecheck with the other original equation: 2(14) - 11 = 28 - 11 = 17
4r+4g
pi2r can be calculated, but is has no particular mathematical interpretation.
The two equations you must know to solve this are The circumstance of a circle is the value of pi times the diameter c=pi*d -and- The radius of a circle is halve the diameter r=.5d or d=2r If we plug in 62.8 for c, 2r for d and 3.14 for pi, the equation becomes 62.8=3.14*2r Divide by 3.14 20=2r Divide by 2 10=r the radius is ten meters
If I rememember my geometry correctly, the circumference (C) of a circle is defined by the equation C=2r(pi), where r=the radius of the circle. So:13.4=2r(pi)13.4/pi = 2r divide each side of the equation by pi13.4/3.14 = 2r substitute the rough equivalent value of pi into the equation.divide to find the value of 2r.given that the diameter (d) of a circle = 2r, you have your answer.*** I'm sorry, but it HAS been a while since I've had to compute diameters and I DID originally have the wrong equation. The answer as currently written IS correct, however.
|2r + 9| = 5 So 2r + 9 = 5 or 2r + 9 = -5 so that 2r = -4 or 2r = -14 r = -2 or r = -7
12-2r = 10
4r2-25 = (2r)2-52 = (2r-5)(2r+5)
2r-1=9 2r =10 r =5
11
2r + 5 - - 1 When simplified: 2r + 6
2r
Depends on condition. Anywhere from $350 to over $1000.
If: 7 -2r = 13 Then: r = -3
If: -7 = 7-2r Then: r = 7