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3 years ago

What is question A and B?

Mathematics

2 answers:

Mrac [35]3 years ago

8 0

Answer:

Jo turned around and walked back to the starting point

8 km/hr

Step-by-step explanation:

4 km/one-half hr = 8 km/hr

exis [7]3 years ago

3 0

Step-by-step explanation:

If we look at the graph at 10 mins its evident that there has been some movement meaning Joes has moved 1km (as we can see in the graph) away from the starting point.

For the last 30 mins of the graph we can see some changes.

so Joe started at 30 mins and ended at 60mins so there is a difference of 30 mins. In those 30 mins Joe moved from 0km to 4km. Meaning that Joe moved at 4km in 30 mins.

We are going to work this out in KPH. Since we have 30 mins and the unit we are using to measure his speed is measured in hours, we need to double it along with the kilometres he moved so it stays fair and constant. so we will have 8km and 60 min (1 hour). Therefore Joe moved at 8kph.

Hope this helps

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15 + r as a verbal expression

kodGreya [7K]

Hey there!

<h2>ANSWER: $r+15$ </h2><h2>EXPLANATION:</h2><h2> $15+r$ </h2>

Simplify by flipping.

$r+15$

Hope this helps!

- TestedHyperr

7 0

3 years ago

How to solve a system of three equations with substitution

zloy xaker [14]

Answer:

Usually there are the variables x y z but it doesn't matter what they are.

Step-by-step explanation:

First choose your first variable to solve. Find x by putting all the numbers and variables to one side.

once you found x substitute the answer for x in all the equations. Next find y and substitute your answer in all the equations again.

Once you have solved 2 variables then you are able to solve z.

If you have questions please feel free to ask in the comments below.

4 0

3 years ago

Which equation has the same soultions as x^2+6×-7=0

blagie [28]

$x^2+6x-7=0 \\ a=1 \\ b= 6 \\ c=-7 \\ \\ \boxed{\boxed{\Delta=b^2-4ac}} \\ \\ \Delta=6^2-4*1*(-7) \\ \Delta=36-(-28) \\ \Delta=64 \\ \Delta\ \textgreater \ 0 \Rightarrow \text{we have 2 solutions :} X_1 \ and X_2 \\ \\ \boxed{X_1= \frac{-b- \sqrt{\Delta} }{2a} } \Rightarrow X_1= \frac{-6-8}{2}=-7 \\ \\ \boxed{X_2= \frac{-b+ \sqrt{\Delta} }{2a} } \Rightarrow X_2= \frac{-6+8}{2} =1$

4 0

2 years ago

Effectus [21]

Answer:

Step-by-step explanation:

7 0

2 years ago

2. The oil company wants to transport 27L/min of oil through the pipes. Find the maximum

SVETLANKA909090 [29]

Answer:

2. The oil company wants to transport 27L/min of oil through the pipes. Find the maximum

flow of oil that can flow through the pipes (per minute) to show that this demand cannot

be met. Clearly explain how you have found the maximum flow.

8 0

3 years ago