Answer:
16.52
Step-by-step explanation: There are more sig figs
I’m guessing it’s the first one
Answer:
The value of x in all the cases is 
.
Step-by-step explanation:
The given equation is:
a. Add 4 on both the sides. The equation becomes 
The operation of addition (or subtraction) done on both the sides of the equation will not alter the value. They will still be equal. However, adding a non - zero term to only one side of the equation will result in the equation becoming unequal.
b. Equivalent Equations are those equations which have the same roots or solutions. Note that, the equations and have the same solution. Then these equations can be named 'equivalent equations'.
c. Subtraction:
Subtract any number from both the sides of the equation, say, 5.
. The solution is still not altered.
Multiplication:
Multiply through by 2. We get: 
. The value of x is still the same.
Division:
Divide through out by -2. The solution is unaltered.
Note that operations of Multiplication and Division are to be done by non -zero numbers. Otherwise it would be altered.
Answer:
40%
Step-by-step explanation:
3 out of 5 = 60 out of 100
if he scores 60 out of 100 = he miss 40 goals
Answer:
x can be 3, -3, i, or -i.
Step-by-step explanation:
If you can't find the factoring by looking at this, simplify the equation.
let
x
2
=
y
to make things easier to see
Now we have
y
2
−
8
y
−
9
=
0
See it now?
We can factor into
(
y
−
9
)
(
y
+
1
)
Now substitute back in
x
2
for
y
.
(
x
2
−
9
)
(
x
2
+
1
)
Since
(
x
2
−
9
)
is a difference of two squares,
(
x
−
3
)
(
x
+
3
)
Now we have
(
x
−
3
)
(
x
+
3
)
(
x
2
+
1
)
x can be 3, -3 for the first two parts
x
2
+
1
=
0
can become
x
2
=
−
1
Taking the positive and negative root means
x
=
±
√
−
1
Thus
x
=
±
i
in addition to 3 and -3.
