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fredd [130]
3 years ago
12

WILL GIVE BRAINLIEST IF CORRECT!!

Mathematics
1 answer:
alexgriva [62]3 years ago
5 0

Answer:  

4 miles

Step-by-step explanation:

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Jane spent 3 hours exploring a mountain with a dirt bike. First, she rode 55 miles uphill. After she reached the peak she rode f
Neko [114]

Answer:

Her speed on the summit was 35 mph.

Step-by-step explanation:

Her speed on the summit was "x" mph while her speed while climbing was "x - 10" mph. The distance she rode uphill was 55 miles and on the summit it was 28 miles. The total time she explored the mountain was 3 hours. Therefore:

time uphill = distance uphill / speed uphill = 55 / (x - 10)

time summit = distance summit / speed summit = 28 / x

total time = time uphill + time summit

3 = [55 / (x - 10)] + 28 / x

3 = [55*x + 28*(x - 10)]/[x*(x - 10)]

3*x*(x - 10) = 55*x + 28*x - 280

3x² - 30*x = 83*x - 280

3x²  - 113*x + 280 = 0

x1 = {-(-113) + sqrt[(-113)² - 4*(3)*(280)]}/(2*3) = 35 mph

x2 = {-(-113) - sqrt[(-113)² - 4*(3)*(280)]}/(2*3) = 2.67 mph

Since her speed on the uphill couldn't be negative the speed on the summit can only be 35 mph.

6 0
3 years ago
If f(x) = 5x + 40, what is f(x) when x equals -5?
sladkih [1.3K]
f(x)=5x+40\\\\x=-5\\\\\text{substitute the value of x to the equation}\\\\f(-5)=5\cdot(-5)+40=-25+40=15
3 0
3 years ago
what is 1+1? My daughters teacher said the answer wasn't 2 when she wrote it on her worksheet. please help a parent out!! maybe
nikdorinn [45]

Answer:

2

Step-by-step explanation:

Maybe they got confused or could not read her handwriting well because im pretty sure it is 2

8 0
3 years ago
A box has dimensions of 17 inches long, 1.3 feet wide, and 8 inches high. What is the volume of the box? The formula for the vol
s344n2d4d5 [400]
I hope this helps you



Volume =17×1,3×8


Volume =176,8
6 0
3 years ago
jaxon earned $90 at his job when he worked for 9 hours . what was his hourly pay rate in dollars per hour ?
user100 [1]

Answer:

$10 dollars

Step-by-step explanation:

10x9=90

3 0
3 years ago
Read 2 more answers
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