Please explain why you add to find the sum of two negative integers, but subtract to find the sum of a positive and a negative i
nteger. Use a number line or counters in your explanation
2 answers:
Answer with explanation:
⇒When there are two Negative Integers or two Positive Integers, we add them, because, two integers has same sign behind it, it means those two things which are represented through numbers, are moving in same direction.So,Instead of subtracting ,we add them and place the same sign behind the result,means, if two integers has positive sign preceding it, then positive sign precedes the result, otherwise if two integers has negative sign behind it, negative sign precedes the result.
⇒And , if there is one positive and one negative integer, we subtract larger from smaller ,and place that sign that larger integer has, preceding the result.Because when two integers has opposite sign, it means they are moving in opposite direction.
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Answer:
c. 441ft^2
Step-by-step explanation:
Area is height times length and since it's a square, safe to say that the sides are equal in length. So square root both of the given areas of the 2 square:
= 29
= 20
Now u have side b and c of the triangle, it's a right triangle so use the Pythagorean theorem a^2 + b^2 = c^2
a^2 + b^2 = c^2
a^2 + 20^2 = 29^2
a^2 + 400 = 841
subtract 4 from both sides
a^2 = 441
square root both sides
a = 21
Now the side a of the triangle is also a side of the small square therefore
21^2 = 441