9 x 10 to the power of 2 how many times as much as 3 x 10 to the -2 power
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To add fractions together, you must convert the smaller fraction () to a denominator that matches the other fractions denominator.
In this case, 1/2 would become 4/8
We can add 4/8 to 7/8 to get 11/8
Then we can add the 1 to it, which acts as 8.
Which gives us 19/8
Or 2 3/8
Recall your d = rt, distance = rate * time.
so, in his usual speed, say is hmm "r" mph, so in his usual "r" speed, he rolls on for the 48 miles and it takes him "t" hours to get there.
now, if he increases his speed by 2 mph, then his new speed is "r + 2", and he arrives there 4 hours earlier, so if he took "t" hours going at "r" speed, then when he's going faster at "r + 2", he only takes "t - 4" hours, for the same 48 miles.
it cannot be a negative value, since is just a forward speed rate, so can't be -6.
so, in his usual speed, say is hmm "r" mph, so in his usual "r" speed, he rolls on for the 48 miles and it takes him "t" hours to get there.
now, if he increases his speed by 2 mph, then his new speed is "r + 2", and he arrives there 4 hours earlier, so if he took "t" hours going at "r" speed, then when he's going faster at "r + 2", he only takes "t - 4" hours, for the same 48 miles.
it cannot be a negative value, since is just a forward speed rate, so can't be -6.