3 years ago

8. Solve for the given variable in the following equations. (4 marks total)

Mathematics

1 answer:

____ [38]3 years ago

6 0

Step-by-step explanation:

V= π*r²*h

V/π = r²*h

v/(π*r²) = h

$\frac{x+y}{3}$ = 5

x+y = 15

x = 15-y

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The graph shows distances traveled by two boats.

lisabon 2012 [21]

To find the speed of the boats we will divide the distance by time.

From the graph we finde the boats' speeds as ;

$Boat\quad 1\quad =\quad \frac { 35 }{ 5 } =\quad 7\quad km/h\\ \\ Boat\quad 2\quad =\quad \frac { 35 }{ 7 } =\quad 5\quad km/h$

And for the speed of the third boat, we will also divide the distance by time.

$Boat\quad 3\quad =\quad \frac { 32 }{ 4 } =\quad 8\quad km/h$

As you can see the speed of boat 3 (8 km/h) is more than boat 1 (7 km/h) and boat 2 (5 km/h).

Thus the third boat is faster than both of them.

The answer is B.

You can see the speed of boat 1 and 2 in the picture.