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Maths help

wrong.PNG
I get 5×29=2560 5 \times 2^{9} = 2560 but clicked 2555 as it was the closest, am I correct or wrong?


Question 2 (file below... failed to upload)
I get
Unparseable latex formula:

[br]2 + 5 + 8 + 11 (d = 3, a = 2)[br]S_n = \frac{1}{2}_n(2a +(n-1)d)[br]S_5_0 = 25(4 + 147) = 3775


The answer is 3925.


Question 3 (file below... failed to upload)
3^{9) = 19683
3^{10} = 59049 >> removed latex due to " virus potential reasons " (TSR security at its finest)

What am I doing wrong? I know the powers but I don't know how to do the question formula.



Question 4 (file below... failed to upload)
S = a / 1 - r --> removed this from latex for " security reasons "
[br]ar2=117[br]S=121.5[br] [br]ar^{2} = 117[br]S = 121.5 [br]

What do I do from here????
(edited 7 years ago)
idk1.PNG21.0KB
idk2.PNG38.5KB
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Avatar for ckfeister
ckfeister
OP
19
Should be all fixed now...

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