1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
katrin [286]
3 years ago
6

LAST QUESTION ON MY TOPIC!!! PLEASE

Mathematics
1 answer:
nataly862011 [7]3 years ago
5 0

Givens

<em><u>Slower car</u></em>

r = r

t = 12 hours

d = ?

<em><u>Faster car</u></em>

r = r + 20

t = 8 hours

d = ?

It doesn't matter what the exact distance is. You just have to know that the 2 distances are equal ie going to the mountains from his home is the same distance as going from the mountains to his home.

d = r * t

r * 12 hours = (r + 20)* 8 hours.   Remove the brackets on the right

r*12 = 8r + 20*8

r*12 = 8*r + 160

r*12 - 8r = 8r - 8r + 160

4r = 160

r = 40 miles / hour

=================

Slower Ride determines the distance.

d = r*t

d = 40 * 12

d = 480

Check

Use the faster rate (r + 20) = 40 + 20 = 60 mph

60 * 8 = 480. Both distances work out to be the same.

You might be interested in
A teachers desk is 5.5 meters long a students desk is 220 centimeters long what is the difference in the length in centimeters b
Mama L [17]

so if 5.5 is in meter let change it to cm because the question want us to give the answer in cm.

1cm = 0.01meter

to \: turn \: meters \: into \: \\  cm \: we \: have \: to \: multiply \:  by \: 100

now we multiply 5.5 times 100 which is equal to 550.

next we subtract 550 - 220= 330.

finally, the difference between a teacher and student is 330cm .meaning the teacher's desk is 330 cm longer or taller than the student.

7 0
3 years ago
There are 475 students and teachers going on a field trip a school bus holds 78 people how many buses are needed for the trip
kap26 [50]
7 is the answer, you have to divide 475 by 78 and you get 6.08974358974359 but you round it up to 7 to make sure you have enough buses
7 0
3 years ago
What is (x - 3)2 + 2x - 4 for x=5 ?
yuradex [85]

Answer:

(x - 3)2 + 2x - 4 \\ (5 - 3)2 + 2 \times 5 - 4 \\ (2) \times 2 + 10 - 4 \\ 4 + 10   - 4 \\ 14 - 4 = 10

7 0
3 years ago
Write the polynomial in standard form. 2z^4-9z-3z^2
lilavasa [31]

i do not have the answer but i have a website that will help you, its called symbolab and it will change ur life

5 0
3 years ago
What are some characteristics of a good math explanation
Eva8 [605]
Its detailed and explained you also check your work and give where you get the info from.
3 0
3 years ago
Read 2 more answers
Other questions:
  • 16
    11·2 answers
  • A ship at position (1, 0) on a nautical chart (with north in the positive y direction) sights a rock at position (6, 5). What is
    9·1 answer
  • Help me with this<br>pls​
    12·2 answers
  • the cost of a personal pizza is $4. a drink cost $1. Anna wrote the equation y=4x + 1 to represent the relationship between tota
    11·2 answers
  • If the x- and y-values in each pair of a set of ordered pairs are interchanged, the resulting set of ordered pairs is known as t
    6·1 answer
  • Use the rules of exponents to evaluate and simplify the following expression. Type all without negative exponents. Do not distri
    11·1 answer
  • (-4/7) • (8/5)? in fraction!
    9·2 answers
  • Bert is driving along a country road at a constant speed of 30 miles per hour. How long does it take for him to travel 50 miles?
    8·1 answer
  • How would you find the missing value? 15/4=5/x
    8·1 answer
  • Find the area.<br> 8 in<br> 19 in<br> 13 in<br> 1976 in²<br> 205 in²<br> 128 in²<br> 104 in²
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!