Question

help help help
please​

Answer 1

Answer:

a) Exact: 128.065

b) Two significant figures: 128.07 OR 128.06

c) Standard form, or expanded form: 1.28065 x 10²

Step-by-step explanation:

(11.2)² - (0.375 + 3)

= 125.44 - 0.375 + 3

= 125.065 + 3

= 128.065

a) Exact: 128.065

This was already solved for. Use this to derive answers for b) and c).

b) Two significant figures: 128.07 OR 128.06

Use one more than the last significant figure you are keeping to determine.

For significant figure rules in basic rounding: (5 and higher rounds up)

128.065

=> 128.07

For significant figure rules in science: (5 rounds to nearest even number)

128.065

=> 128.06

c) Standard form, or expanded form: 1.28065 x 10²

Keep first digit, write the decimal, then multiply by appropriate power of 10.

128.065

= 1.28065 x 10²