Complete the description of how to find the sums - 7+1 and -7+(-1) on a number line. To find - 7+ 1, start at 0. Draw the arrow for-7. Then, from
To find -7+(-1), start at 0. Draw the arrow for - 7. Then, from
draw the arrow for 1; the sum is
draw the arrow for -1; the sum is

Evaluate the expression for the given value of the variable. | ? 4 b ? 8 | + ? ? ? 1 ? b 2 ? ? + 2 b 3 -4b-8+-1-b2+2b3 ; b = ? 2 b=-2

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.