4.5 times 10 to the first power... or just 10 4.5X10
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To write -45 as a decimal, you simply write "-45.0" or "-45.00" to indicate the number includes a whole number and decimal point. The decimal form of -45 represents the same value as the integer -45, but with a decimal point to show its position on the number line. The negative sign indicates that the number is less than zero.
3 and 3/4 hours.
By writing the 45 minutes as a fraction of an hour. One hour is 60 minutes, so write the 45 over 60 and simplify.
Thirteen thousand, four hundred fifty.
Another way to write 45% would be 0.45, 45/100, 450/1000, or 4500/10000.