The elevation of Death Valley, California, is -282 feet. The Mississippi River in Illinois has an elevation of 279 feet. Which is closer to sea level?

Find the absolute value.

|-6|.

Tell whether the sum is positive, negative, or zero without adding. Explain your reasoning.

-10+(-18)

Choose the correct options: -9-5

A. -9+5

B. 9+(-5)

C. -9+(-5)

D. 9+5

Tell whether the product is positive or negative without multiplying. Explain your reasoning.

-3 $\cdot$ 12

Tell whether the quotient is positive or negative without dividing.

-12 $\div$ 4

For what values of a and b is the statement true?

|a-b|=|a|-|b|

Add.

1149+2021

According to a legend, the Chinese Emperor Yu-Huang saw a magic square on the back of a turtle. In a magic square, the numbers in each row and in each column have the same sum. This sum is called the magic sum.

Copy and complete the magic square so that each row and each column has a magic sum of 0 . Use each integer from -4 to 4 exactly once.

Divide.

27 $\div$ 9

Add.

181+217

For what values of a and b is the statement true?

|a+b|=|a|+|b|

Starting at point A, the path of a dolphin jumping out of the water is shown.

a. Is the dolphin deeper at point C or point E ? Explain your reasoning.

b. Is the dolphin higher at point B or point D ? Explain your reasoning.

Reasoning Two integers, a and b, have a product of 24 . What is the least possible sum of a and b ?