11/3 - 2/3 = 9/3 = 3 so he spent 3 more hours reading on saturday than on friday
Hope this helps!
Answer:

Step-by-step explanation:
The question to be solved is the following :
Suppose that a and b are any n-vectors. Show that we can always find a scalar γ so that (a − γb) ⊥ b, and that γ is unique if
. Recall that given two vectors a,b a⊥ b if and only if
where
is the dot product defined in
. Suposse that
. We want to find γ such that
. Given that the dot product can be distributed and that it is linear, the following equation is obtained

Recall that
are both real numbers, so by solving the value of γ, we get that

By construction, this γ is unique if
, since if there was a
such that
, then

Answer:
The width of the photo is
.
Step-by-step explanation:
From the given figure it is notices that the total width of the frame is

The photo is covered by a frame border and the width of the border is

To find the width of the photo we have to subtract the width of upper frame border and lower frame border from the total width of frame.
Width of the photo is




Therefore the width of the photo is
.