Perform the indicated operation and write the result in the form a + bi.
X^4+7x^2-18=0

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Mis the midpoint of rq if rm equals 2x + 5 and mq equals 4x - 9 what is the length of rq