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Anettt [7]
3 years ago
10

Chelsea writes the expression (n + 1)(n + 2) + 2n for the number of circles used to make the nth figure in the pattern shown.

Mathematics
1 answer:
Nikolay [14]3 years ago
3 0

Answer:

Step-by-step explanation:

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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
Zarrin [17]

Answer:

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

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:

(1) x\times140 + y\times80 = 60\times120

140x+80y = 7200

or  7x+4y = 360 .........[3]

(2) x + y = 60

Now multiply equation (2) by 4  

4x + 4y = 240 ...........[4]

Subtract (4) from (3)  

7x+4y-4x-4y=360-240

3x=120

x=\frac{120}{3}

x=40

Put x in equation [4] we get,

4(40) + 4y = 240

160 + 4y = 240

4y = 80

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.






7 0
3 years ago
I need help with this question.
Makovka662 [10]
The monthly rent of the apartment is x = 1310 dollars a month

8 0
3 years ago
Help! This question is extremely confusing! WILL GIVE A LOT OF POINT!
steposvetlana [31]

Answer:

<u>1035 feet</u>

Step-by-step explanation:

Taking the tan ratio of the angle of elevation :

  • tan 49° = h/900
  • 1.15 = h/900
  • h = 1.15 × 900
  • h = <u>1035 feet</u>
6 0
1 year ago
Read 2 more answers
A=7.5<br> B=30<br> C=15 square of 2<br> D= 15
Inessa [10]

I think the awnser is B=30

5 0
2 years ago
A juggler is performing her act using several balls. She throws the balls up at an initial height of 4 feet, with a speed of 15
mestny [16]
The correct answer is B) 1.15 seconds.
8 0
3 years ago
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