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Talja [164]
3 years ago
8

A person drives 15km to the shops at an average speed of 30km/h, then drives back at an average speed of 60km/h. What is their a

verage speed over the two journeys?
Mathematics
1 answer:
____ [38]3 years ago
8 0
30 km/h to the store. 60 km/h back from the store.

(60 + 30) \ 2

We use the mean average formula.

90 \ 2

Final answer: 45
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Please help with my math :)
defon

Answer:

33,3

Step-by-step explanation:

Set it up as a proportion in correspondence with their unit of measurement:

\frac{16}{21,3} = \frac{25}{?} → \frac{[21,3][25]}{16} → \frac{532,5}{16} = 33,28125 \\ \\ 33,3 ≈ P

I hope this is correct, and as always, I am joyous to assist anyone at any time.

8 0
3 years ago
Plz Answer In your own words Explain what the vertical line test is and how it is used.
zavuch27 [327]

Answer:

See below (I hope this helps!)

Step-by-step explanation:

The vertical line test is a test used to determine whether a relation is also a function. It is done by inserting several vertical lines that intersect the relation. If a vertical line intersects the relation at multiple point, then it is not a function. If every single inserted vertical line intersects the relation at only one point, then the relation is a function.

7 0
3 years ago
Use the graph of y=sin theta to find the value of 2theta for theta = pi/4 radians
Mariana [72]
We have that
y=sin x

for x=2theta
<span>theta = pi/4 radians
so
x=2*pi/4-----> x=pi/2

using a graph tool
see the attached figure

for x=pi/2
y=sin pi/2------> y=1
</span>
the solution is
1

3 0
4 years ago
Write the function in vertex form. y=-x^2-8x-9
xeze [42]

Answer:

y = -(x+4)² +7

Step-by-step explanation:

I find it convenient to factor the leading minus sign from the first two terms, then work with what's left.

... y = -(x² +8x) -9

Now, add the square of half the x-coefficient inside parentheses. Add the opposite of that amount outside parentheses.

... y = -(x² +8x +4²) -9 +4²

... y = -(x +4)² +7 . . . . . . . . . rewrite parentheses as a square; collect terms

4 0
3 years ago
290 divided by 70 estimate to
labwork [276]
290 divides by 70 is 4.14285...
Estimated to the ten thousandths: 4.1429
Estimated to the thousandths: 4.143
Estimated to the tenths: 4.14
4 0
3 years ago
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