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Q: What is 28 plus 21?

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-7 + 28 = 21

7 + 21 = 28

228

1 + 2 + 3 + 4 + 6 + 7 + 12 + 14 + 21 + 28 + 42 = 140

3x + 7 = -4x + 28 implies 7x + 7 = 28

14 plus 14,8 plus 20,9 plus 21

13 + 16 + 18 + 20 + 21 + 26 + 27 + 27 + 28 + 36 + 39 + 42 + 43 = 356

1/2 + 3/4 + 5/7 = 14/28 + 21/28 + 20/28 = 55/28

basically you asked what -28+21 which equals -7

Rephrase the question - it is not meaningful

n = 7. 3(7) + 7 = 28. 21+7=28

28 - 3(3 + 4) = 28 - (3 x 7) = 28 - 21 = 7

21

25x+3x+21 = 32+51+9 Collect all like terms together and notice the change from +21 to -21, this is done in order to keep the equation in balance. 25x+3X = 32+51+9-21 28x = 71 Divide both sides of the equation by 28 to find the value of x: x = 71/28 or 2 and 15/28 x = 2.535714286 as a decimal

28 X .75 = 21 or 28 x 3/4 = 21

22+22+28+28=100.

6 + 3 + 21 + 63 + 21 = 114

No. The age limit is always "Half plus seven." So anyone who is at least 21 years old (28/2, +7 = 21) and over is A-okay.

7+(7*3) because 7*3=21 and 21+7=28, which is equal to 28, the product of 4*7.

5n + 7 = 28 + 2n (-2n) 3n + 7 = 28 (-7) 3n = 21 therefore, n = 7

b 21 28 35 42 49

21

(21-21)+(21-21)+21 = 0+0+21 = 21

It is: 28-21 = 7

28 * 21 = 588