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alex41 [277]
3 years ago
5

A commuter has $345 in his commuter savings account. This account changes by -$15 each week he buys a ticket. In one time period

, the account changed by -$240.
a. For how many weeks did the commuter buy tickets?
_________________________________________________________________________
b. How much must he add to his account if he wants to have 20 weeks’ worth of tickets in his account? ________________________________________________________
Mathematics
1 answer:
Roman55 [17]3 years ago
7 0

Answer:

A.16 weeks

B. $195

Step-by-step explanation:

A.

345-15x=345-240

345-15x=105

15x=240

x=16

B.

345-240=105

20x15=300

105+x=300

x=195

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Another way you can think of it is you could remove the negative, and put them in order from least to greatest. Then when you add the negative back you would flip the order. So let's do that with our current problem: (Keep in mind that if you do this with sequences that are not all negative numbers you need to make the positive numbers negative. Or you can write out a number line and put all the numbers on it) 

Our Numbers:
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Put the numbers in order from least to greatest:
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