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The first thing you have to do is pick numbers for the blanks.
@peachpi do I just pick any numbers
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