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Anna35 [415]
3 years ago
12

PLEASE SHOW THE STEPS TO ALL THE QUESTIONS FOR 20 POINTS!

Mathematics
1 answer:
alexandr402 [8]3 years ago
6 0
2y-7>15
2y> 15+7
2Y > 22
2Y/2>22/2
y > 11
put any number below 11 in the left side it will be less then 15


2x-5> 1
2x > 1 +5
2x > 6
2x/2 > 6/2
x > = 3
put 3 instead of x in the left side it will be equal to the right side or put anything less then 3 then the left side will be less then 1

2x+5>1
2x > 1-5
2x > -4
2x/2>-4/2

x> -2

put -2 instead of x it will be equal to the right side anything less then -2 then it will be less the the right side
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one tamk of gasoline has an octane rating of 140 and another tank of gasoline has an octane rating of 80. To obtain a mixture of
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Answer:

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Step-by-step explanation:

Given : One tank of gasoline has an octane rating of 140 and another tank of gasoline has an octane rating of 80. To obtain a mixture of 60 gallons with an octane rating of 120.

To find : How many gallons should be used from the tank with the octane rating of 80?

Solution : Let x be the volume of gas whose octane rating is 140 and

y be the volume of gas whose octane rating is 80.

Then, we form the equation as:

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Now multiply equation (2) by 4  

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Subtract (4) from (3)  

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y=\frac{80}{4}

y=20

Therefore, x=40 and y=20

So, 20 gallons were used from the tank with the octane rating of 80.






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Step-by-step explanation:

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