Exponents, Computation Of Whole Numbers, Probability Of A Simple Event

To evaluate (0.5) to the second power, we need to multiply 0.5 by itself. When we do this, we get 0.25 as the result.

To evaluate 5 to the third power, we need to multiply 5 by itself three times. So, 5 to the third power is equal to 5 x 5 x 5, which equals 125.

The given expression is a subtraction problem: -12 - 5. When subtracting a negative number, it is equivalent to adding its positive counterpart. So, -12 + (-5) is equal to -17.

The probability of Jon pulling out a green marble can be calculated by dividing the number of green marbles (9) by the total number of marbles in the bag (3 + 7 + 9 + 6 = 25). Therefore, the probability is 9/25.

To evaluate 1/2 to the third power, we need to multiply 1/2 by itself three times. When we do this, we get (1/2) * (1/2) * (1/2) = 1/8. Therefore, the correct answer is 1/8.

The given expression is 75 - (-15). When subtracting a negative number, it is equivalent to adding the positive of that number. Therefore, -(-15) becomes +15. So, the expression simplifies to 75 + 15, which equals 90.

The given expression is -8 - (+7). The positive sign before 7 indicates that it is a positive number. When we subtract a positive number from a negative number, we add the absolute values and keep the sign of the larger number. In this case, the absolute value of -8 is 8 and the absolute value of +7 is 7. Adding them together gives us 15. Since -8 is the larger number and it is negative, the answer is -15.

The given expression is "2 + 5". When we add 2 and 5, the sum is 7. However, there is a positive sign in front of the 5, indicating that it is positive. So, the expression becomes "2 + (+5)" which is equivalent to "2 + 5". Therefore, the answer is 7.

When subtracting a negative number, it is equivalent to adding the positive form of that number. In this case, we have -7 - (-9), which can be rewritten as -7 + 9. Adding these two numbers gives us 2, so the correct answer is +2.