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The first thing you have to do is pick numbers for the blanks.
yes and for the 2nd blank decide whether you want it to increase or decrease
Ok so if I say she practices piano for 10 on Monday and increases by 5 min everyday
ok. so now you can write the formula for the sequence. \[a_n=a_1+d(n-1)\] \(a_1\)=10 because that was how much she practiced on the first day d = 5 because that's how much it increases each day. Plug them in to get the formula for you specific numbers
did you get a formula?
No how do I plug it in
Oh never mind I see I'll write it down
So an stays blank
right. both an & n don't change for this step
Ok I got an=15+5n
So or idk how to write the a and the n the way u did my bad
an = a1 + d(n-1) an = 10 + 5(n - 1) an = 10 + 5n - 5 an = 5n + 5 I think you may have added wrong somewhere
Now for the last step you plug in 7 for n to find \(a_7\). \[a_7=5(7)+5\]
I added the 5 to the 10
ok. That was it. It was supposed to be -5 added to the 10
So would it be 15 + 5n or no
It's 5 + 5n
Ok I got a7=40
that's right :)
Wait so that's it
Omg thank you so much could you help me with another if you can it's the same but with a geometric sequence
yeah. just post another question and tag me