Answer:
1
Step-by-step explanation:
11 in - 7 in = 4 in
a^2 + (4 in)^2 = (5 in)^2
a^2 + 16 in = 25 in
a^2 = 9 in
a = 3 in
7 in x 3 in = 21 in
1/2( 3 in ) ( 4 in ) = 6 in
a = 21 in + 6 in = 27 in
The first step for finding y is to divide both sides of the equation by 9.
9y ÷ 9 = 2x ÷ 9
When dividing 9 by 9 you must remember that any expression divided by itself equals 1.
y = 2x ÷ 9
Now write 2 ÷ 9 as a fraction.
y =

x
This means that the answer to your question is that y =

x.
Let me know if you have any further questions.
:)
Answer:
(x) =
x + 7
Step-by-step explanation:
let y = f(x) and rearrange making x the subject, that is
y = 3(x - 9) + 6 ← distribute and simplify right side
y = 3x - 27 + 6 = 3x - 21 ( add 21 to both sides )
y + 21 = 3x ( divide all terms by 3 )
y + 7 = x
Change y back into terms of x with x =
(x) , thus
(x) =
x + 7
If every minute 3 poles past and poles are 1/4 mile (0.25 mile) apart;
3x0.25 = 0.75
Train moves 0.75 mile/per minute
If you want the train's speed per hour, then;
x = 60x0.75
x= 45miles per hour is the speed of the train