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eduard
2 years ago
5

What was the average speed if I drove 60 miles per hour to get to my grandmas house and 30 miles per hour to get home. Represent

this in two different ways and explain your reasoning.
Mathematics
1 answer:
siniylev [52]2 years ago
8 0

Answer:

40 mph.

Step-by-step explanation:

Suppose grandma's house is  30 miles away (any distance would do but 30 is convenient).

Speed = distance / time

time = distance / speed

Time to get there =  30/60 = 1/2 hour.

Time to get back = 30/30 = 1 hour

Average speed  = total distance/ total time

=  (30 + 30) / ( 1 + 1/2)

= 60 / 1.5

=  40 miles per hour.

You cannot take the average of the speeds directly

(60+ 30)/2  = 45 is not correct as you cannot average ratios ( speed is a ratio).

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Answer:

1/8

Step-by-step explanation:

-3p+1/8=-1/4

subtract 1/8

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divide by -3

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8 0
3 years ago
What is the percentage increase of a room that is the size of 96 square feet to a room that is 108 square feet?
katrin [286]

Answer:

12.5% increase OR 112.5% Percentage of Change

Step-by-step explanation:

For this problem consider that our original maximum value is 96 square feet, but our new maximum value is 108 square feet. So to find the change as a percentage (in this case the increase) use the following formula:

Percentage of Change = ( New Maximum / Old Maximum ) * 100

So, let's use this formula to find the percentage change of the room.

Percentage of Change = ( 108 / 96 ) * 100

Percentage of Change = (1.125) * 100

Percentage of Change = 112.5

So the percentage of Change is 112.5%. Note, the old maximum is the point of comparison which is 100%.

So to find the increase, we will do 112.5% - 100% to get 12.5%. Hence, we have a 12.5% increase of a 108 square foot room compared to a room of 96 square feet.

Cheers.

6 0
2 years ago
Which of the following statements is true of chords?
nydimaria [60]
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6 0
3 years ago
I need help with question
Sergeu [11.5K]

Answer:

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Step-by-step explanation:

Given

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2 years ago
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