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3 years ago

Please help !!

Mathematics

1 answer:

nikdorinn [45]3 years ago

5 0

The domain is all the numbers of which the inputs can be put. Here, we have a graph, which simplifies things. We just need to look at the x-values of the graph, or the horizontal line. The graph extends both negatively and positively. Thus since the graph extends both ways (right and left) forever, the answer would be D, or all real numbers.

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4 0

3 years ago

The distance between two cities A and B is 400km. A car leaves from A towards B at a speed of 90kmph, at the same time another c

MrRissso [65]

Answer:

a. Distance = 400 - 200t

b. see attached graph

c. A travelled 180 km, B travelled 220 km, both took 2 hours.

Step-by-step explanation:

Given

distance = 400

A = 90 km/h

B = 110 km/h

A & B drive towards each other

Solutions

a) equation

Let

t = elapsed time in hours,

D(t) = distance between two drivers

D(t) = 400 - (A+B) t

D(t) = 400 - 200t ......................(1)

b. graph : for graph, see attached figure.

c. Distance and time

Time:

solve for t with the distance D(t) = 0 using equation (1)

0 = 400 - 200 t

200t = 400

t = 2 hours

distance travelled by A = 2 hours * 90 km/h = 180 km

distance travelled by B = 2 hours * 110 km/h = 220 km

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3 years ago