Write each number in standard notation.
17) 0.9 x 10
18) 2 x 10-4
19) 2 x 10
20) 804 x 102
21) 2.66 x 10
22) 1.5 x 10-2
23) 7.75 x 10-
24) 8.3 x 10

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Step-by-step explanation:

17) 9

18) 2.0000

19) 20000000000

20) 00.804

21) 266.0000000000

22) 15.00

23) 77.5

24) 830.0000000000

4x and 6y

im not sure though

7.25

step-by-step explanation:

we know that 7 equals to 7.0. we also know that 1/4=0.25. so we can add the two together and we get 7.25