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Nataliya [291]
2 years ago
12

An old car has to travel a 2-mile route, uphill and down. Because it is so old, the car can climb the first mile, the ascent, no

faster than an average speed of 15 mi/h. How fast does the car have to travel the second mile, on the descent, to achieve an average speed of 30 mi/h for the trip
Mathematics
1 answer:
Molodets [167]2 years ago
3 0

Answer:

2s + 30 = 2s

Step-by-step explanation:

Time up hill + time down hill = total time

:

Multiply equation by 30s; results

2s + 30 = 2s

:

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Help please! Could you explain it too?
Anettt [7]

Answer:

a) not proportional

b) proportional; k = -\frac{3}{5}

Step-by-step explanation:

a) for any proportional equation, the line must pass through the origin. The equation in a) is y = 4x + 1, and the '+1' is the y-intercept. This means that the line does not pass through the origin, so x and y cannot increase by the same amount (i.e. they are not proportional).

Another way to determine this is is to use the y = kx base. If you have an equation that fits that it's likely proportional.

Here, if the equation was only y = 4x then it'd be proportional because u can see that k = 4. This is not the equation though, and the 4x + 1 doesn't fit to the y = kx formula so it can't be proportional.

b) straight away you can see that there's no 'c' term (y = mx + c) which means the y-intercept is 0, so the line passes through the origin. While this does not immediately mean the line is proportional, you can make sure that it is by checking it fits with the y = kx equation.

y = -(3/5)x fits with y = kx, with k being -3/5

3 0
2 years ago
It is given that R=2q-5 and Q=3p+2. Find the numerical value of R when p=3​
saveliy_v [14]

Answer:

R = 17

Step-by-step explanation:

R = 2q - 5

Q = 3p + 2

Find the numerical value of R when p = 3

R = 2q - 5

R = 2(3p + 2) - 5

R = 6p + 4 - 5

R = 6p - 1

When p = 3

R = 6(3) - 1

R = 18 - 1

R = 17

4 0
3 years ago
I need help im kinda stuck lol
anastassius [24]

Answer:

1 person did as you can see

5 0
2 years ago
Read 2 more answers
Perfect Square Trinomials: 1. Give an example of a perfect square trinomial. 2. Explain why it is a perfect square trinomial. 3.
Ainat [17]

Answer:

1. x^{2} -12x+36 is a perfect square trinomial

Step-by-step explanation:

2. Perfect square trinomials are algebraic expressions with three terms that are created by multiplying a binomial to itself.

3. I will upload a picture showing my work

4 0
3 years ago
What is 2380 divided by 8 <br>in partial quotients<br>​
TiliK225 [7]
8
2380
=
8 goes into 80 0 times then goes into 380 47.5 times then it goes into 2000 250 times so 250 + 47.5 = 293.5
3 0
3 years ago
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