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Fofino [41]
3 years ago
8

Tabitha and her parents drive to Dallas for a wedding. After 90 minutes, Tabitha's father tells her they have traveled 105 miles

. What is the average rate of speed the car travels in 90 minutes?
Mathematics
1 answer:
BARSIC [14]3 years ago
6 0
Im pretty sure it would be 70 mi/h
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Answer:

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Step-by-step explanation:

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3 years ago
11. The completion of a chemical reaction is expressed by the equation y = 300 - 4x - XP, where y is
alina1380 [7]

Answer:

The reaction ca occur at 10 degree Celsius or -14 degree Celsius.                                          

Step-by-step explanation:

We are given the following in the question:

The completion of a chemical reaction is expressed by the equation

y = 300 - 4x -x^2

where y is  the number of seconds needed to complete the reaction and x is the temperature in degrees Celsius  at which the reaction occurs.

We have to find the temperature at which the reaction occurs, if the completion time of reaction is 160 seconds.

Putting y = 160

160 = 300 - 4x -x^2\\x^2 + 4x  - 140 = 0\\x^2 + 14x -10x -140 = 0\\x(x+14)-10(x+14)=0\\(x-10)(x+14) = 0\\(x-10) =0, (x+14) =0\\x = 10, x = -14

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5 0
3 years ago
A car uses a litre of petrol to travel 4km. How many litres will it use to travel 32 kilometres.
lesya [120]

Given that,

A car uses a litre of petrol to travel 4 km.

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3 0
3 years ago
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zysi [14]

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Step-by-step explanation:

\sqrt{98} = 7\sqrt{2}

5 0
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Bogdan [553]

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6 0
3 years ago
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