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
dlinn [17]
3 years ago
8

Nola hiked down a trail at a steady rate for 10 minutes. Her change in elevation was -200 feet. Then she continued to hike down

for another 20 minutes at a different rate. Her change in elevation for this part of the hike was -300 feet. During which portion of the hike did she walk down at a faster rate ? Explain your reasoning
Mathematics
1 answer:
Delicious77 [7]3 years ago
7 0
Her speed is minutes per foot or feet per minutes, so we have 10 minutes/-200 feet=-1/20 feet. Since it doesn't matter that it's negative (we care about the speed, and you can't have negative speed), we get the absolute value (1/20). For the next 20 minutes, we have |20 minutes/-300 feet|=1 minute/15 feet. Since 1/20=0.05 and 1/15 is 0.0666667, 1/15 is clearly higher and the 20 minute portion was at a faster rate
You might be interested in
Maria takes 2 hours to plant 50 flower bulbs. Lois takes 3 hours to plant 45 flower bulbs. Working together, how long should it
kherson [118]

Answer:

Maria:  (50 bulbs)/(2 hours) = 25 bulbs/hour

Lois:  (45 bulbs)/(3 hours) = 15 bulbs/hour

Together:  25 + 15 = 40 bulbs/hour

(150 bulbs)/(40 bulbs per hour) = 3 3/4 hours

(3/4 hours)(60 minutes/hour) = 45 minutes

Total time:  3 hours 45 minutes

6 0
2 years ago
Read 2 more answers
Can you guys help please im so confused
marissa [1.9K]

Answer:

a) see below

b) 40x20 meters

Step-by-step explanation:

Write down what you know:

- The area of the enclosure is length*width, so

A = x \cdot y

- The length of the fencing is 80 meters, so

2y + x = 80

Now we have to combine these two equations above, and get rid of y in the process.

First rewrite the second as:

y = 40 - \frac12 x

Then substitute for y in the first:

A = x (40 - \frac12 x) = 40x - \frac12x^2

b) To maximize A, find the zero of the first derivative:

A'(x) = 40 - x = 0 \implies x=40

So y = (80-40)/2 = 20 meters.

8 0
2 years ago
A jar contains 6 blue gumballs, 4 yellow gumballs, and 8 red gumballs. What is the probability of choosing a yellow gumball and
Anna [14]

Answer:

2/9 or 22.22% and 4/9 or 44.44%

Step-by-step explanation:

6+4+8=18   4/18=2/9   8/18=4/9

3 0
2 years ago
What is <br> 4^ -3<br> 4^ -2<br><br> 2^ -3 + 3<br> 2^ -2 +3<br> 2^ -1 + 3
Scrat [10]
1/4³ or 1/64
1/4² or 1/16
1/2³ + 3 or 3 1/8 or 3.125
1/2²+3 or 1/4 +3 or 3 1/4 or 3.25
1/2¹ +3 or 3 1/2 or 3.5
6 0
3 years ago
Factor completely, then place the factors in the proper location on the grid. 9 - 6a - 24a2
andre [41]
-3 (2a - 1) (4a + 3)
3 0
3 years ago
Read 2 more answers
Other questions:
  • Factor each expression <br> 8+16
    12·1 answer
  • Identify a number that results in a 4-digit-number when 156,350 is subtracted from it
    13·1 answer
  • I need help on this please!!
    14·1 answer
  • A holiday costs £1200. Work out the price after a 7% discount.
    13·1 answer
  • Find the ratio a:c if <br>a:b = 1:2, b:d = 4:5, d:c = 3:1<br>​
    13·1 answer
  • What is the equation of the line that passes through point P (6, -8) and has a slope of zero?
    6·1 answer
  • If sec θ =25/24, find cot θ.
    10·1 answer
  • Find the number that makes the ratio equivalent to 11:1.<br> ?:4
    8·2 answers
  • The two figures are similar. Find the ratios (red to blue) of the perimeters and of the areas. Write the ratios as fractions in
    14·1 answer
  • HURRY PLEASE I WILL MARK BRAINLIEST!!!!!!!!!!!(Bible)
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!