Question

Plzzz HELP (3 QUESTIONS!!)

6) Which of the following numbers is written in standard notation for 1.31x10^-5?

a) 11,310
b) -11,310
c) .01131
d) .00001131

7) Select the expression written in scientific notation that is equivalent to 4.8 x 10^5-9.7 x 10^4.

a) -4.83x10^9
b) 480,000-97,000
c) 3.83x10^5
d) 0.000048 – 0.00097

8) Select the expression that is equivalent to (4 x 10^3)(5x10^7).

a) 4.5 x 10^3+7
b) (4+5) (10^3+10^7)
c) 4.5 x 10^3x7
d) ( 4 x 5) (10^3+10^7)

Answer 1

6: d, 7: b and c, 8: a

Explanation:

6) The answer is (d).

We have,

0.00001131 =1.131×0.00001

= 1.131/100000

= 1.131×10^-5.

So, this is correct answer.

7) This question have two answers (b) and (c), both are correct.

(b) 480000-97000

= 4.8x100000-9.7x10000

=4.8x10^5-9.7x10^4

(c) 4.8x10^5-9.7x10^4

= 4.8x10^5-0.97x10^5

= (4.8-0.97) x10^5

=3.83x10^5

8)(a)

(4 x 10^3)(5x10^7).

= 4x5x10³x10^7

= 4x5x10^(3+7).