Jeff drives 140 miles in 4 hours. part a: what is his rate of change?

Rate of change is miles per hour.

Step-by-step explanation:

Rate of change is measure that describes how one quantity changes relative to the other.

Here one quantity that is measured is distance and the other is time.  

So the rate of change can be expressed as,

Rate of change =

=

= miles per hour

Therefore rate of change is miles per hour

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!

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step-by-step explanation: