What must be true is the expression will actually be adding 10 + (+ x), because of the two marks you have to make when subtracting by a negative.
The subtraction sign is also the negative sign. So in this case, the expression is also saying -x, which means there is two negative signs.
A double negative is a positive, so in this case the x will be turned to a positive integer.
If this is still too confusing, she can plug in a number to replace x. Let’s try it with -2:
Ex. 10 - (-2)= 12.
The two negative signs turn into one positive sign, AKA an addition sign. So, the above expression can be simplified as 10 + 2, or 12.
Answer:
6 = 600
Step-by-step explanation:
in a decimal number the digits to the left of the decimal point represent a whole number
Answer:
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<em>A</em><em> </em><em>and</em><em> </em><em>D</em>
We are assuming that the initials are different. Let them be A, B, C, D.
Clearly ABCD is the only possible outcome where the letters are in alphabetical order.
The total number the outcomes, is the number of permutations of these 4 letters.
The first letter can be any of the 4, the second, any of the 3 left (after having picked the first one), the third any of the 2 left (after picking the second one), and the fourth one is only 1 possibility.
So the total number of outcomes (permutations) is 4*3*2*1=24
P(alphabetical order)=1/24
Answer: 1/24
