Cephus and Reesie were trying to hire a band to accompany them on their showcase tonight. The Soule Brother's Keeper charge $800 booking fee and $150 an hour for the perfomance. Write the equation that represents this senerio if Cephus and Reesie ended up paying $1284.50 for their showcase.

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Assume that 1400 births are randomly selected and 1378 of the births are girls. use subjective judgment to describe the number of girls as significantly high, significantly low, or neither significantly low nor significantly high. choose the correct answer below. a. the number of girls is neither significantly low nor significantly high. b. the number of girls is significantly high. c. the number of girls is significantly low. d. it is impossible to make a judgment with the given information.

What is the number 321,000,000 in scientific notation? also what is the number? ?