Consider newtons equation: v = (a * t) + u, and you need to isolate a because you have the values for v, t and u and need to find a, first subtract u from both sides, gives v - u = (a * t) + u - u, the + u - u cancel leaving v - u = a * t, so essentially you've moved the u from one side to the other, then you would divide both sides by t, the t's would cancel out on the right side, leaving
(v - u) / t = a, essentially you've moved the t over to the other side, now a is isolated and can be calculated.
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Consider x + 4 = 10: find x (isolate x), subtract 4 from both sides, leaving
x + 4 - 4 = 10 - 4, the 4's cancel out on the left, leaving x = 10 - 4, so x = 6
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subtract the two sides that you know from the perimeter to get the unknown side.
To explain this, I'll use the example equation: 3x+8=5x-4 To get the variable alone, you must add, subtract, multiply, or divide both sides by the correct numbers to get x on one side. This is easier than it sounds. First, get x on one side. To do this, subtract both sides by 3x, which gives you: 8=2x-4 Next, you must get all the constants on the other side. To do this, add 4 to both sides, giving you: 12=2x Finally, you have to remove the coefficient from x. To do that, divide both sides by 2, which gives you: 6=x Plug that back into your original equation, which gives you: 3(6)+8=5(6)-4 18+8=30-4 26=26 This is a true statement, so we know that we have the correct answer.
The perimeter of a rectangle is the sum of its sides, so 2 lengths plus to widths: P = 2l + 2w We know P and w: 730 = 2l + 2(75) 730 = 2l + 150 Subtract 150 from both sides: 580 = 2l Divide both sides by 2: 290 = l The length is 290 meters.
To get the perimeter, you need to add all three sides. I assume you can get the third side by inserting the numbers you know into Heron's formula.
Well if you don't know what the numbers are then you can let x be an even number, then your consecutive numbers would be x, x+2, x+4,x+6 etc. so lets say that x is an even number and you are told that x and the three consecutive even numbers after it added together equals 48. then you would say: x + (x +2) + (x + 4) + (x + 6) = 48 combine like terms and you get: 4x + 12 = 48 subtract 12 from both sides 4x = 36 x = 9 and there you have it. Hope this helps :)