Review : Decimal, Laws of exponent, and Scientific Notation

Solve: (-29.95) + 31.15

• 1.20

• -1.20

• -61.10

• 61.10

(-49.81) - 24.50

• -25.31

• 25.31

• 74.31

• -74.31

(-37.8) x (-0.23)

• -8.694

• 8.694

• -86.94

• 86.94

(0.82) divided by (-0.12)

• 0.6833...

• -0.6833...

• 6.833...

• -6.833...

Tina ran 4 times around the track. She ran the first two rounds at a timing of 2.8 min each. She took 2.55 min and 2.05 min to run the third and the fourth round respectively. How long did she take to run the 4 rounds in total? Express your answer in min.

• 7.4 minutes

• 8.4 minutes

• 9.45 minutes

• 8.45 minutes

Teacher Shey had 25 m of cloth. She used 3.2 m of the cloth to sew a pair of pants. She used the remaining cloth to sew 4 coats of the same design. What was the length of cloth teacher Shey used to sew each coat?

• 4.55 m

• 5.45 m

• 5.54 m

• none of the choices

Simplify: (-10a⁵b⁶) ÷ (-2.5 a²b³)

• 4a³b³

• -4a³b³

• 4a⁷b⁶

• -4a⁷b⁶

Answer the question

• 2a⁵/b⁷

• 8a⁵/b⁷

• 2a⁵/b³

• 8a⁵/b³

Answer the question

• c¹¹ / 2d⁷

• c¹¹ / 8d⁷

• c¹¹ / 2d³

• None of the other choices

Answer the question

• 5b² / a⁸

• 25 b²/ a⁸

• 125 b²/ a⁶

• None of the other choices