Answer:
y= (-7/16)
Step-by-step explanation:
Multiply (3/4)(1/4)= (3/16)
y= (3/16)-(5/8)
y= (-7/16)
I hope this is right, im not 100% sure
Answer:
A x, y
Step-by-step explanation:
Hopefully this helps
Answer:
Function: 
Not Function:
and 
Step-by-step explanation:
Given



Required
Determine if
is a function of 
Solving x+y=9

Make y the subject of formula

<em>Hence; y is a function of x</em>
Solving 

Subtract x² from both sides

Square root of both sides

This implies that
or 
<em>Because </em>
<em> can be any of those two expressions, it is not a function.</em>
Solving 

Reorder

Take square roots

This implies that
or 
<em>Because </em>
<em> can be any of those two expressions, it is not a function.</em>
Let S be the first side.
Longest side is then 2S.
Third side is 2S-10.
Perimeter is sum of all three sides = S+2S+2S-10 = 75
=>
5S-10=75
5S=75+10=85
S=17
Therefore
S=17 is the first side.
Longest side is then 2S=2*17=34.
Third side is 2S-10=2*17-10=24.
The answer is 67.6
You have to find the angle that has cos=8/21=0.381.