1. what is the simplified form of the expression? 7m^2 + 6.5n - 4n + 2.5m^2 - n a 9.5m^2 + 1.5n b 4.5m^2 + 1.5n c 1.5m^2 - 4.2n d 9.5m^2 - 1.5n 2. what is the product? 4 • (-5) a -20 b 20 c -1 d -9 3. which property is illustrated by the statment? 2(-6/7) = (-6/7)2 a associative property of addition b inverse property of multiplication c commutative property of multiplication d commutative property of addition 4. which property is illustrated by the statment? 3.2 + 4 = 4 + 3.2 a associative property of additional b commutative property of multiplication c inverse propertys of multiplication d commutative property of addition

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Answers:

1. 9.5m^2 + 1.5n

2. 41/20

3. -2.3, -1/3, √3, √7, 5.1

4. 2/9x-1/3

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the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.