What is the solution to (4 x 10^3) x (3 x 10^4) written in scientific notation

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read

Define the type of sequence below. -2,0,2,4,6 a. both arithmetic and geometric b. arithmetic c. neither arithmetic nor geometric d. geometric

Me with these questions , i don’t understand scientific notation!