Hi. I need help with these questions (see image)
Please show workings.

see explanation

Step-by-step explanation:

Using the chain rule

Given

y = f(g(x)), then

= f'(g(x))  × g'(x) ← chain rule

and the standard derivatives

( x ) = , (lnx) =

(a)

Given

y =

= × (

   = × × (1 + x)

   = × × 1

   =

   =

(b)

Given

y = ln sinx

= × (sinx)

   = × cosx

   =

   = cotx

93.8

step-by-step explanation:

lets say, first number = x

second number = 3x+7

total = 49

(x)+(3x+7)= 49

4x+7 = 49

4x = 42

x = 42/4

x= 10.5

x= 10.5

3x+7 = 3(10.5)+7 = 93.8

hope this

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.