What is the exact value of 400,000x200

80,000,000

Step-by-step explanation:

We can rewrite this expression as:

(4 x 10⁵) x (2 x 10²)

To solve this, we multiply first 4 x 2 = 8 and then we multiply the powers of ten using law of exponents:

10⁵x10²= 10₇.

Therefore, the answer is: 8 x 10⁷. If we write it in decimal form we would have:

80,000,000

-21

Step-by-step explanation:

multiply 21x0x8= 0

divide 6/2 = 3

multiply -8x3 =-24

0+3-24=-21