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2 years ago

15

The sum of three numbers is 15 the second number is 2 times the first the 3rd nimber is 30 less than the second what is the thir

d number

1 answer:

7nadin3 [17]2 years ago

5 0

Answer:

i think about it

Step-by-step explanation:

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2/3-1/4 I want the answer please

klemol [59]

You want to make the fractions have the same denominator.
2/3 = 8/12
1/4 = 3/12
now subtract the numerator and keep the denominator the same...
8/12 - 3/12 = 5/12
5 1/2 is the answer

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3 years ago

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2/5 - (-4/3) = what does it equal because im really confused

ira [324]

Answer:

26/15

Step-by-step explanation:

See attached image.

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2 years ago

An airliner travels 45 miles in 6 minutes. what is the speed in miles per hour?

Romashka-Z-Leto [24]

6 minutes/60minutes = 0.1 hrs
45miles/0.1hour = 450 miles per hour or mph

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2 years ago

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Solve the simultaneous equation y-2x+1=0 and 4x^2+3y^2-2xy=7

Lapatulllka [165]

The first equation is $y-2x+1=0$

$y=2x-1$ (Equation 1)

The second equation is $4x^{2}+3y^{2}-2xy=7$ (Equation 2)

Putting the value of x from equation 1 in equation 2.

we get,

$4x^{2}+3(2x-1)^{2}-2x(2x-1)=7$

$4x^{2}+3(4x^{2}+1-4x)-4x^{2}+2x=7$

by simplifying the given equation,

$12x^{2}-10x-4=0$

$6x^{2}-5x-2=0$

Using discriminant formula,

$D=b^{2}-4ac$

$D=25-4 \times 6 \times -2 = 73$

Now the formula for solution 'x' of quadratic equation is given by:

$x=\frac{-b+\sqrt{D}}{2a} and x=\frac{-b-\sqrt{D}}{2a}$

$x=\frac{5+\sqrt{73}}{12} and x=\frac{5-\sqrt{73}}{12}$

Hence, these are the required solutions.

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2 years ago

4 % of blank days is 56 days

klasskru [66]

We have an equation: 56/? = 4/100

Cross multiply:
4*? = 56*100
⇒ ? = 56*100/4 = 1,400

There are 1,400 blank days~

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2 years ago

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