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Anna [14]
3 years ago
15

If pq=7 and qr=28 then what is pr

Mathematics
2 answers:
polet [3.4K]3 years ago
8 0
If pq=7 and qr=28 then,
p=7/q and r=28/q

pr=7/q×28/q
pr=196/q^2

Hope it helps you
Flura [38]3 years ago
3 0

Answer:

pr = 4.

Step-by-step explanation:

If pq=7 and qr=28 then what is pr?

qr / pq = r/p = 28/7 = 4.

prq^2 = 7 * 28 = 196

196 = 2 * 2 * 7 * 7

q^2 is a perfect square so looks like it could be 49 then pr would be  4.

Since r/p = 4 then r = 4 and p = 1 would  suit the equalities.

Checking with the given information: pq = 1 *7 = 7 and qr = 7*4 = 28 so we have the right answer.

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