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scZoUnD [109]
3 years ago
12

Solve the equation 2x^2+8x-1=0 by completing the square. Give your answer to 2 decimal places 4 marks

Mathematics
1 answer:
ad-work [718]3 years ago
3 0

Answer:

Step-by-step explanation:

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A car traveled 300 miles on 15 gallons of gas. How many miles does the car travel on 1 gallon of gas?​
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20 miles for 1 gallon.

Step-by-step explanation:

20 x 15 = 300

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A customer wants to put in a concrete driveway that is 10" thick. How much concrete would it take to pour a driveway that measur
stellarik [79]

Answer: 22.59 yd^3

Step-by-step explanation:

First the volume of a cuboid whose measurements are:

L = length, W = width and T = thiknes is:

V = L*W*T.

We want to calculate the volume of a shape that is:

10'' thick, 18' wide and 42' long.

This notation is:

(') = feet

('') = inches

The first step is to write our 3 numbers in the same units, then we can use that:

1 inch = 0.083 ft.

Then 10 inches are equal to:

10'' = 10*(0.083 ft) = 0.83 ft = 0.83'

Then the volume of concrete needed will be:

V = 0.83ft*18ft*42ft = 627.48 ft^3

But we want this expressed in yd^3

1ft = 0.33 yd

then

1ft^3 = (0.33 yd)^3 = 0.036 yd^3

then 627.48 ft^3 can be written as:

627.48 ft^3 = 627.48*( 0.036 yd^3) = 22.59 yd^3

8 0
3 years ago
6. y = -3x + 2<br> y = -3x - 7
Mkey [24]

Answer:

No Solution.

Step-by-step explanation:

y=-3x+2

y=-3x-7

------------

-3x+2=-3x-7

-3x-(-3x)+2=-7

-3x+3x+2=-7

2=-7

no solution

8 0
3 years ago
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