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Q: What is 7 x 30?

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7x = 210210 / 7 = xTherefore x = 30.7 x 30 = 210.

30 (30 x 7, 30 x 15)

2730

-37

No. 30 x 7-3 = 120 27 x 7 = 189

Example: 7/30 + 5/42Find the LCD by factoring them.2 x 3 x 5 = 302 x 3 x 7 = 422 x 3 x 5 x 7 = 210, the LCD30 x 7 = 21042 x 5 = 2107/30 x 7/7 = 49/2105/42 x 5/5 = 25/21049/210 + 25/210 = 74/210Simplify if necessary.7/30 + 5/42 = 37/105

Example: 7/30 + 5/42Find the LCD by factoring them.2 x 3 x 5 = 302 x 3 x 7 = 422 x 3 x 5 x 7 = 210, the LCD30 x 7 = 21042 x 5 = 2107/30 x 7/7 = 49/2105/42 x 5/5 = 25/21049/210 + 25/210 = 74/210Simplify if necessary.7/30 + 5/42 = 37/105

Example: 7/30 + 5/42Find the LCD by factoring them.2 x 3 x 5 = 302 x 3 x 7 = 422 x 3 x 5 x 7 = 210, the LCD30 x 7 = 21042 x 5 = 2107/30 x 7/7 = 49/2105/42 x 5/5 = 25/21049/210 + 25/210 = 74/210Simplify if necessary.7/30 + 5/42 = 37/105

Let the numbers be x and y, then x + y = 60 (which yields y = 60 - x) xy = 1600 (replace y with 60 - x) x(60 - x) = 1600 60x - x2 = 1600 (multiply by -1 to both sides) x2 - 60x = -1600 (add 302 to both sides to complete the square) x2 - 60x + 302 = -1600 + 900 (x - 30)2 = -700 (take the square root of both sides) x - 30 = ± √-700 (add 30 to both sides and write -700 = (100)(7)(-1)) x = 30 ± (√100)(√7)(√-1) x = 30 ± (10√7)i So, x = 30 + (10√7)i or x = 30 - (10√7)i thus, y = 60 - [30 + (10√7)i] or y = 60 - [30 - (10√7)i ] y = 30 - (10√7)i or y = 30 + (10√7)i Therefore, [30 + (10√7)i] + [30 - (10√7)i] = 60 [30 + (10√7)i] [30 - (10√7)i] = 1600 Check:

10 - 3 = 7 and 10 x 3 = 30

Example: 7/30 + 5/42Find the LCM of the denominators.2 x 3 x 5 = 302 x 3 x 7 = 422 x 3 x 5 x 7 = 210, the LCM30 x 7 = 21042 x 5 = 2107/30 x 7/7 = 49/2105/42 x 5/5 = 25/21049/210 + 25/210 = 74/210Simplify if necessary.7/30 + 5/42 = 37/105

The answer is 4.71*10^-7.

5 x 7 x 24 3 x 7 x 40 4 x 7 x 30

2 x 3 x 5 = 30 2 x 3 x 7 = 42 2 x 3 x 5 x 7 = 210, the LCM

2 x 7 = 14 3 x 7 = 21 2 x 3 x 5 = 30

6 x 7 = 4230 x 7 = 21042 + 210 = 252

2 x 7 = 14 2 x 3 x 5 = 30 2 x 3 x 5 x 7 = 210, the LCM

70 x 30 = 2100 7 x 30 = 210

2 x 3 x 5 = 30 2 x 3 x 7 = 42

x=2(3)(5+7) x=6(5+7) x=30+42 x=72

210

30 = 2 x 3 x 5 105 = 3 x 5 x 7

210. 30 = 2 x 3 x 5 21 = 3 x 7 lcm = 2 x 3 x 5 x 7 = 210

2 x 3 x 5 = 30 2 x 5 x 7 = 70 2 x 3 x 5 x 7 = 210, the LCM

2 x 3 x 5 x 7 2 x 3 = 6 6 x 5 = 30 30 x 7 = 210 2 x 3 x 5 x 7 = 210