leah drives her car to the mechanic then takes the commuter

. 2

Step-by-step answer

08.02.2023, solved by verified expert
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Answer:

The expression for Leah’s total travel time is 20r+150 r(r+15)

The total time is 5/9 h, or about 33 min

Step-by-step explanation:

We know, time = distance/speed
Distance= 10 mi
Speed of car = r mi/h 
Time taken by car = 10/r h
Speed of commuter rail = r+15 mi/h
Time taken by rail = 10/(r+15) 

Total time for the trip:  

10/r +10/r+15 

= 10(r+15)/r(r+15) + 10r/r(r+15)

=10r + 150 + 10r/r(r+15) 

= 20r +150/r(r+15).....(1)

At a driving rate of 30 mph, putting r = 30 in equation (1) total time,

20r+150/r(r+15) = 20(30)+150/30(30+15)

= 750/1350

= 5/9 h 

= 5/9×60 

= 33.33 min 

= 33 min ( by rounding off)

The expression for Leah’s total travel time is 20r+150 r(r+15)

The total time is 5/9 h, or about 33 min

It is was helpful?

Faq

Mathematics
Step-by-step answer
P Answered by Master

the answer would be A. Since he currently doesn't have enough fund within his ban account using a credit card is advised greatly. Credit cards are good for emergencies like his case. it allows the holder to be able to purchase the items needed without immediate pay, but he would still end up paying the amount he used plus some probable interest due to possible interest rate in the card company.

Step-by-step explanation:

Mathematics
Step-by-step answer
P Answered by Master

the answer would be A. Since he currently doesn't have enough fund within his ban account using a credit card is advised greatly. Credit cards are good for emergencies like his case. it allows the holder to be able to purchase the items needed without immediate pay, but he would still end up paying the amount he used plus some probable interest due to possible interest rate in the card company.

Step-by-step explanation:

Mathematics
Step-by-step answer
P Answered by PhD

See explanation!

Step-by-step explanation:

We know that the maximum miles allowed before oil change is 5,000miles (thus Kaci can drive less or up to 5,000 miles but not more).

Kaci has already driven 3,450miles since last oil change.

Inequalities are typically employed to show a relating or comparative relationship between expressions and can be identified by the sybolism of less, more or/and equal to (i.e. , , \leq, \geq ).

Let us denote the miles Kaci can drive before oil changing again by x, then we can write the following inequality:

3450+x\leq 5000

solving for the remaining miles x allowed

3450+x\leq 5000\\x\leq 5000-3450\\x\leq 1550

Thus Kaci can drive up to and including 1550 miles before chaging car oil again.

Mathematics
Step-by-step answer
P Answered by PhD

See explanation!

Step-by-step explanation:

We know that the maximum miles allowed before oil change is 5,000miles (thus Kaci can drive less or up to 5,000 miles but not more).

Kaci has already driven 3,450miles since last oil change.

Inequalities are typically employed to show a relating or comparative relationship between expressions and can be identified by the sybolism of less, more or/and equal to (i.e. , , \leq, \geq ).

Let us denote the miles Kaci can drive before oil changing again by x, then we can write the following inequality:

3450+x\leq 5000

solving for the remaining miles x allowed

3450+x\leq 5000\\x\leq 5000-3450\\x\leq 1550

Thus Kaci can drive up to and including 1550 miles before chaging car oil again.

Physics
Step-by-step answer
P Answered by PhD

D) Heat, because friction produces heat, not light, gravitational or chemical. hope this helps! : )

Biology
Step-by-step answer
P Answered by Specialist

A mechanical brake applies a friction force to convert the kinetic energy of the vehicle into thermal energy which then dissipates into the atmosphere. As with any system, the process of braking must follow the principle of conservation of energy.

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