7840-group all the same denominations together like this: 6 thousand + 1 thousand is 7 thousand, 5 hundred +3 hundred is 8 hundred and 4 tens 4 times 10, means count by tens.
Answer
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Step-by-step explanation:
Answer:
D. 1.2
h(x)=a*f(x)
vertical stretch: |a | > 1
