A customer purchases a pair of jeans and a few shirts. Each shirt costs the same amount. The expression 60 + 20x represents the
cost before tax. What do the different parts of the expression model? Drag the parts of the expression into the boxes to match each description.
Cost of jeans=
total cost of the shirts=
(I think that 60 represents the price for the jeans and 20x represents the shirts)
Cost of jeans=
total cost of the shirts=
(I think that 60 represents the price for the jeans and 20x represents the shirts)
2 answers:
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Answer:
It takes takes them 31.67 secs to meet after Person A starts walking
OR
34.67 secs after Person B starts walking
Step-by-step explanation:
First, we will find the perimeter of the rectangle
From,
Perimeter of rectangle = 2 ( +
)
Where is the length
and is the breadth
From the question, = 100m
and = 50m
Hence,
Perimeter of the rectangle = 2 (100+50)
= 2(150) = 300m
Hence, the perimeter of the rectangle is 300m
This is the total distance that will be covered by both persons by the time they meet.
Let the distance covered by person A be
and the distance covered by person B be
We can write that
+
= 300m
Velocity of person A, = 4 m/s
and velocity of person B, = 5 m/s
From the question, Person A starts walking 3 seconds after person B,
This means, if person A spends secs before they meet, then person B would spend (3 +
) secs.
For Person A,
Velocity = 4 m/s
Time = secs
Distance =
From,
Then,
...... (1)
For Person B
Velocity = 5 m/s
Time = (t + 3) secs
Distance =
Also, from
...... (2)
Recall that, +
= 300m
Then, = 300m -
We can then write that,
300m -
Then,
..... (3)
Equating equations (1) and (3), we get
This is the time spent by Person A
Hence, it takes takes them 31.67 secs to meet after Person A starts walking OR
34.67 secs after Person B starts walking
Answer:
Time required by Machine B to create a widget = 4 hours
Step-by-step explanation:
Time taken by Machine A ( ) = 3 hours
Time taken by Machine B ( )= x hours
Time taken by both machines by working together = 12 hours
The time required to both machines by working together to finish a task is given by the formula =
Put the values in above formula we get
⇒ T =
⇒ 12 =
⇒ 36 + 12 x = 3 x
⇒ x = - 4 hours
This is the time required by Machine B to create a widget.