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
artcher [175]
3 years ago
14

A bicyclist rides his bike each day on a trail not far from his house. During the first part of the ride he is pedaling mostly u

phill and his average speed is 6 miles an hour. After a certain point, he is traveling mostly downhill and averages 15 miles per hour. If the total distance he travels is 30 miles and the total time he rides is 4 hours, how long did he ride at each speed?
Mathematics
1 answer:
Likurg_2 [28]3 years ago
5 0

total time, t = 4hours

1st speed, a = 6 mph

2nd speed, b = 15mph

total distance covered, d = 30miles

time spent at 6mph, x

time at 15mph, y

total time, t = x + y

=》4 = x +y...eqn 1

total dist, d = ax + by

=》30 = 6x + 15y...eqn 2

subst for y (= 4 -x) in eqn 2

30 = 6x + 15(4-x)

= 》 9x = 30

x = 3 1/3 = 3 hrs 20mins

y = 4 - 3 1/3 = 2/3 = 40mins

You might be interested in
Please I need help I totally forgot how to do it
Hunter-Best [27]
<span><span> 5n2+10n+20</span> </span>Final result :<span> 5 • (n2 + 2n + 4) </span>

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "n2"   was replaced by   "n^2". 

Step by step solution :Skip Ad
<span>Step  1  :</span><span>Equation at the end of step  1  :</span><span> (5n2 + 10n) + 20 </span><span>Step  2  :</span><span>Step  3  :</span>Pulling out like terms :

<span> 3.1 </span>    Pull out like factors :

  <span> 5n2 + 10n + 20</span>  =  <span> 5 • (n2 + 2n + 4)</span> 

Trying to factor by splitting the middle term

<span> 3.2 </span>    Factoring <span> n2 + 2n + 4</span> 

The first term is, <span> <span>n2</span> </span> its coefficient is <span> 1 </span>.
The middle term is, <span> +2n </span> its coefficient is <span> 2 </span>.
The last term, "the constant", is <span> +4 </span>

Step-1 : Multiply the coefficient of the first term by the constant <span> <span> 1</span> • 4 = 4</span> 

Step-2 : Find two factors of  4  whose sum equals the coefficient of the middle term, which is  <span> 2 </span>.

<span><span>     -4   +   -1   =   -5</span><span>     -2   +   -2   =   -4</span><span>     -1   +   -4   =   -5</span><span>     1   +   4   =   5</span><span>     2   +   2   =   4</span><span>     4   +   1   =   5</span></span>
5 0
4 years ago
I cant solve this help –8x + 15 &lt; 71
Ratling [72]

Answer:

x > -7

Step-by-step explanation:

Isolate the variable, x. Treat the < sign like an equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS.

PEMDAS is the order of operation, and stands for:

Parenthesis

Exponents (& roots)

Multiplication

Division

Addition

Subtraction

First, subtract 15 from both sides:

-8x + 15 (-15) < 71 (-15)

-8x < 71 - 15

-8x < 56

Next, divide -8 from both sides of the equation. Note that when you divide by a negative number, you must flip the sign:

(-8x)/-8 < (56)/-8

x < (56)/-8

x > -7

x > -7 is your answer.

~

6 0
3 years ago
Read 2 more answers
1.Write an example of how the product of two different irrational numbers can be a rational number.
Digiron [165]

Answer:

1 "The product of two irrational numbers is SOMETIMES irrational." The product of two irrational numbers, in some cases, will be irrational. However, it is possible that some irrational numbers may multiply to form a rational product.

2 The quotient has widespread use throughout mathematics, and is commonly referred to as a fraction or a ratio. For example, when dividing twenty (the dividend) by three (the divisor), the quotient is six and two thirds. In this sense, a quotient is the ratio of a dividend to its divisor.

3 The sum of two irrational numbers, in some cases, will be irrational. However, if the irrational parts of the numbers have a zero sum (cancel each other out), the sum will be rational. "The product of two irrational numbers is SOMETIMES irrational."

Step-by-step explanation:

3 0
3 years ago
Answer as soon as possible please
Brut [27]

Non of these is the 2nd diagram.

Corresponding angles are 3rd and 5th diagram.

Alternate internal angles are 4th diagram.

Alternate exterior 1st diagram

4 0
3 years ago
PLEASE!!! I'LL GIVE YOU MY HOUSE IF YOU CAN ANSWER THIS!!! PLUS BRAINLIEST ANSWER! Y= 1\2x-2. COMPLETE THE ORDERED PAIRS (2,_) (
Reptile [31]

Plug each x-value into the equation to get the y-value:

\frac{1}{2} (2)-2=1-2=-1

(2,-1)

\frac{1}{2} (0)-2=0-2=-2

(0,-2)

8 0
3 years ago
Other questions:
  • Which statement is true about the end behavior of the graphed function?
    15·2 answers
  • A baseball player hit the ball 42 times out of the last 150 times at bat. What is the player's experimental probability of getti
    7·1 answer
  • to paint a sunset, tran makes a shade of orange paint using 5 drops of red paint for every 8 drops of yellow paint. if tran uses
    9·2 answers
  • How do you Find percent markup
    6·1 answer
  • 6(x+4)-(x+3)&gt;x-1 solve the inequality
    15·1 answer
  • Find the area of a circle with a radius of
    8·1 answer
  • Select the correct months.
    6·2 answers
  • What can you multiply by 3 and add 2 to get -19?
    9·1 answer
  • PLEASE HELP!! 7.9 divided by 276.5. Show your work on a paper or online thanks! &lt;3
    12·1 answer
  • there are 5 different math books, 1 social studies book, and 2 different science books on the shelf. how many different ways can
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!