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3 is to 9 as 7 is to what?

How much is there in 2 yards?

MATH AGAIN?
One pump can empty a pool in 5 days, whereas a second pump can empty the pool in 8 days. How long will it take the two pumps, working together, to empty the pool? The first pump's rate is 1/5 The second pump's rate is 1/8 The combined pumps rate is 13/40 It will take the two pumps days to empty the pool together. = 
Are there ships in the sea?

What s a zero sided shape called?

Which is earlier 500 BC or 400 BC?

Alevel maths help. A(7, 2) and C(1, 4) are two vertices of a square ABCD. Find the equation of the diagonal BD?

If the diameter of a circle is 34 inches what is the radius?

What is 2x2?

Please help. Thanks I'm advance?
It takes 15 minutes to fill 125 gallons with petrol from a tanker. How long will it take to fill 72 gallons 
What is the degree of e^(y/x)?

Similar Triangles Help?
Best answer: Refer to the picture below.
Using similar triangles we have:
f/1.5 = (a + b)/a
Now, a² = 5² + 1.5² => 27.25
i.e. a = √27.25
Hence, f/1.5 = 50/√27.25
so, f = (50 x 1.5)/√27.25 => 14.37 metres
:)> 
Round to the nearest tenth 66?

What is 5x5?

A sphere has a volume of 101 cm3. What is its radius (in cm)?

How is horse?

Help factorise this equation?
Best answer: this cannot be factored in the real number domain.
quadratic equation:
to solve ax² + bx + c = 0
x = [–b ± √(b²–4ac)] / 2a
x = [–4 ± √(16–60)] / 6
x = [–4 ± √–44] / 6
x = [–4 ± 2√–11] / 6
x = –(2/3) ± i(1/3)√11
where i = √–1
edit, corrected typo 
I dont know how to solve this. can someone tell me step by step without giving away the answer... (2+8i)(28i) thank you in advance...?

Determine the sum of the first 100 numbers. (arithmetic sequence)?
In an arithmetic sequence, the first three numbers are 100, 96 and 92. Determine the sum of the first 100 numbers. I only know that the answer is 9800, can someone show how I can get this answer? 
Round 222+203?