How do I solve this problem?

I can't get any further with this task:

So far I have already written the following:

But c) doesn't make any sense, since it doesn't match the graph.

What did I do wrong and how can I solve the task correctly?

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Tannibi
1 year ago

Not in percent, but in fractions.

Then the first equation is:

0.9 = 0,89^x

Dissolve this after x.

AaronHappke204
1 year ago

Don’t be angry. ABER: Please contact Teacher’s Prayer, He can explain this to you!