Final answer:
The word form for 1.7 is 'one and seven tenths', and the expanded form is 1 + 0.7.
Step-by-step explanation:
When writing a decimal greater than 1 in word form, you would start by reading the whole number part, which in this case is 1. Then, you would say 'and' to represent the decimal point, followed by the digits after the decimal point. So, the word form for 1.7 is 'one and seven tenths'.
For the expanded form, you would break down the decimal into its place values. In this case, the whole number part, 1, is in the ones place. The digit after the decimal point, 7, is in the tenths place. So, the expanded form for 1.7 is 1 + 0.7.