Which number is written correctly in scientific notation?

A 4.89 x 10-8

B 10.3 x 104

C 6.45 x 25

D 0.34 x 103

Current research indicates that the distribution of the life expectancies of a certain protozoan is normal with a mean of 46 days and a standard deviation of 10.5 days.

Meredith went to visit her aunt over the weekend. It took her 1.5 hours to get there. If Meredith's aunt lived 96 miles away from Merediths home, what was her average rate of speed?

Find the slope of y=7

Which expression is not a polynomial? A. 5x5 B. 8x10+2x5 C. 5x-1+4x-2 D. x5+2

What is 1/3 + 1/4 equal in math

recently 5/8 of the items sold at Debbies Sporting Good were baseball caps. at Sasha Sports 7/10 of the items sold were baseball caps which store sold a greater fraction of baseball caps?

You want to find the height of a tower used to transmit cellular phone calls. You stand 100 feet away from the tower and mesure the angle of elevation to be 40°. How high is the tower to the nearest foot

A helicopter leaves central airport and flies north at 180 mi/hr. Twenty minutes later a plane leaves the airport and follows the helicopter at 330mi/hr. How long does it take the plane to overtake the helicopter

A rectangular piece of paper with length 29 cm and width 12cm has two semicircles cut out of it. Find the area of the paper that remains.

Kent earns $49,000 a year and has to pay $45 in taxes for every $1,000. How much taxes does he pay in one year? A. $2,049 B. $2,000 C. $2 205 D. $1,000