Welcome, Guest. Please login or register.

December 13, 2019, 04:27:44 am

Author Topic: Few questions need help with  (Read 339 times)  Share 

0 Members and 1 Guest are viewing this topic.

TyranT

  • Adventurer
  • *
  • Posts: 17
  • Respect: 0
Few questions need help with
« on: July 23, 2019, 05:59:16 am »
0
I have 3 questions i have attached. If anyone could help me with them, it would be much appreciated.

Thanks.

laura_

  • MOTM: JUNE 19
  • Part of the furniture
  • *****
  • Posts: 1071
  • happy, free, confused and lonely at the same time
  • Respect: +518
Re: Few questions need help with
« Reply #1 on: July 23, 2019, 06:59:47 am »
+5
Only in Year 10, so could not figure out 11, but question 10 just relies on using the log laws.

the cage is shattered
the songbird sings
of her freedom once more

soars in blue
basks in the light
leaving nothing
but notes behind

she is never going
back in that cage

TyranT

  • Adventurer
  • *
  • Posts: 17
  • Respect: 0
Re: Few questions need help with
« Reply #2 on: July 23, 2019, 04:47:40 pm »
0
Thanks alot!

fun_jirachi

  • MOTM: AUG 18
  • Forum Leader
  • ****
  • Posts: 558
  • All doom and Gloom.
  • Respect: +292
Re: Few questions need help with
« Reply #3 on: July 23, 2019, 05:27:37 pm »
+3
Just to tack on to laura_'s answer, Q11 requires a little more manipulation.

Note that for any real positive numbers a, x and y, that if:

Hence, 2=log24, since 22=4. The key here is working towards using the same log law demonstrated in Q10 ie. ln(a)+ln(b)=ln(ab) by utilising the same log base for both expressions.

Your expression then becomes log2y=log2(x-1)+log24.

Try going from here :)
Failing everything, but I'm still Flareon up.

HSC 2018: Modern History [88] | 2U Maths [98]
HSC 2019: Physics | Chemistry | English Advanced | Maths Extension 1 | Maths Extension 2

SmellsLikeTeenSpirit

  • Trailblazer
  • *
  • Posts: 32
  • Respect: 0
Re: Few questions need help with
« Reply #4 on: July 30, 2019, 03:04:04 pm »
+1
Hi Tyrant,
Sorry for the delay. The step-by-step solutions are attached. Hope this may help.
Cheers