Identify whether each value is negative or positive.

Step-by-step explanation:

1. negative

2. positive

3.negative

4.positive

5.negative

Step-by-step explanation:

This is all about odd or even minus signs.

-2^2  the power does NOT affect how the answer when there are no brackets around the 2. the answer you want is minus

(-2)^2 This is an entirely different question from the one above.  The power (^2) affects both the 2 and the minus. There are now 2 minus's. The answer is plus.

(-3)^3 means there are 3 minus signs to be multiplied together. Three is an odd number. The answer is minus.

12 is even the brackets includes the sign. The answer is +

171 is minus because 171 is odd.

something that characterises a right triangle is the fact that we may use pythagoras' theorem to find any one of its sides given that we have the length of the other two sides. here, we have the length of the hypotenuse, √(87) yd, and one other side, √(23) yd, thus we can easily find the length of the remaining side using pythagoras' theorem as defined below:

c^2 = a^2 + b^2, where c is the length of the hypotenuse, and a and b are the lengths of the other two sides.

thus, given that c = √(87) and a = √(23), we may substitute these into the formula we defined above to get:

c^2 = a^2 + b^2

(√87)^2 = (√23)^2 + b^2 (substitute c = √87 and a = √23 into the equation)

87 = 23 + b^2 (evaluate (√87)^2 = 87 and (√23)^2 = 23 - remember that the square root of a number, squared will equal that very same number)

64 = b^2 (subtract 23 from both sides)

√64 = b (take the square root of both sides)

8 = b (evaluate √64 = 8)

therefor, the length of the unknown leg in the right triangle is 8 yd (first answer).