Pl ha

select the correct scientific notation form of this numeral.

1,263

a. 12.63 × 10 2

b. 1.263 × 10 3

c. 12.63 × 10 3

d. 1.2 × 10 3

The answer is B.

Step-by-step explanation:

To express a number in scientific notation it has to be expressed in the form a x 10^n

Where 1 < a < 10 and n is an integer

rewrite 1236 as a number between 1 and 10 ie. 1.236 and to get it equal to it's original value we have to multiply by 1000.

So 1236 = 1,236 * 10^3

to complete this square you have to rotate about the origin 270 degrees clockwise.

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.