A relation is a function if & only if for each value of x we have (at the most) one & only one value of y.
In short if we have a repeat value of x that correspond to 2 different values of y then it's not a function but a relation instead
Let's take the 1st example:
x I y
---------I-------
1 I 2
3 I 2
3 I 3
4 I 2
We notice that there are 2 SAME VALUE of x (that is 3) that have various value of y, Hence this is not a function. Mind you this concerns x ONLY.
In short a function doesn't allow a repeat of same x.
Follow this methodology & you will find the other problems
Answer:
51
∘
and
129
∘
Explanation:
Angles that are supplements sum to
180
∘
.
This means if one angle is called
A
∘
, the other angle is
(
A
−
78
)
∘
A
+
A
−
78
=
180
2
A
−
78
=
180
2
A
=
258
A
=
258
2
=
129
∘
A
−
78
=
129
−
78
=
51
∘
Step-by-step explanation:
Answer:
I think it is 30
Step-by-step explanation:
The formula for the perimeter of a rectangle is often written as P = 2l + 2w, where l is the length of the rectangle and w is the width of the rectangle. The area of a two-dimensional figure describes the amount of surface the shape covers. You measure area in square units of a fixed size.
As a decimal point 13/16 is 0.8125