Express the number in scientific notation.21,000,000
A. 2.1 x 106
B. 2.1 x 107
C. 2.1 x 10-6
D. 2.1 x 10-7
Answer: B
You might also like to view...
Given a group of students: 
or 
list and count the different ways of choosing the following officers or representatives for student congress. Assume that no one can hold more than one office.Four representatives
A. ABCD, ABCE, ACDE, ADEB, BCDE; 5 B. ABCD, ABCE, ACDE, ADEB, BCDE, BCEA, BDEA, CABD, CEDB, DACE; 10 C. ABCD, ABCE, ACDE, ADEB; 4 D. ABCD; 1
Represent each of the following situations with a signed number.The bottom of a lake is 268 feet above sea level.
A. +268 B. -268
Solve the problem.The floor of a rectangular storage room is divided into two right triangles by drawing a diagonal. One leg of the resulting triangle, the width of the room, is 
more than two times the other leg, the length of the room. The hypotenuse is 
Find the length and the width of the room.
A. length: 11 ft, width: 15 ft B. length: 10 ft, width: 14 ft C. length: 10 ft, width: 24 ft D. length: 11 ft, width: 26 ft
Find the logarithm. Give an approximation to four decimal places.log e
A. 2.7183 B. 0 C. 0.4343 D. 1