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20.   1 2/25.

21.   32x^2  + 11.

Step-by-step explanation:

20.   (3/4^3 / (5/8)^2

27 /64 / 25/64

= 27/64 * 64/25

=  27/25

= 1 2 /25.

21.

 4x *8x + 7 + 4

= 32x^2 + 11.

20) a

21) a

Step-by-step explanation:

22.83 repeating

step-by-step explanation:

137 ÷ 6 is 22.8333333 therefore we understand that 3 is repeating.

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the number of possible outcomes that do not show a 1 on the first spinner and show the number 4 on the second spinner is 2.

spinner 1 spinner 2

1                     1

1                     2

1                     3

1                     4

2                   1

2                   2

2                   3

2                   4   = not 1, and 4

3                   1

3                   2

3                   3

3                   4 = not 1, and 4

only 2 outcomes have passed the given condition.

step-by-step explanation: