91Ó°ÊÓ

Find each sum. $$6+(-4)$$

Find each sum. $$3+(-7)$$

Find each sum. $$4+(-6)$$

Find each difference. $$-9-(-7)$$

Find each sum. $$-15+6$$

Find each difference. $$-16-(-7)$$

Find each product. $$-6(-8)(11)$$

For Exercises 30 and 31, use the information below. The formula \(d=\left|65-\frac{h+\ell}{2}\right|\) can be used to find degree days, where \(h\) is the high and \(\ell\) is the low temperature. If Charleston, South Carolina, had a high of \(56^{\circ}\) and a low of \(32^{\circ},\) find the degree days.

Find each product. $$4(-7)(-4)(-12)$$

The highest point in California is Mt. Whitney, with an elevation of \(14,494\) feet. The lowest point is Death Valley, with an elevation of \(-282\) feet. Find the difference in the elevations.