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What reason let John Napier invent the logarithm?
There was a demand for a huge number of manual calculations to create tables - many of them for navigational purposes - where similar calculations needed to be repeated many times.
How many square inches are there in a 1 inch circle?
Assuming that 1inch is your diameter, your radius is, of course, 0.5. Since the area of a circle is expressed asA=(pi)r2simply plug in the radius to this equation. You will get your area to be pi*0.25in2, which is roughly equal to 0.78539inches2.
How many 4' x 8' plywood boards are needed to cover a 24' x 32' room?
4' x 8' = 32'224' x 32' = 768'2768 / 32 = 24 boards.
How many calories of heat needed to raise temperature of 8.1 g of water 20C?
1 calorie is defined as the amount of energy needed to raise the temperature of 1 gram of water by 1C, so... It takes 8.1 calories to raise your 8.1 grams by 1C, but you need to raise it 20C. 8.1*20=162. 162 calories is the answer you are looking for.
How many stamps are needed to send a letter from California to Texas?
Currently it's one 44 cent stamp. But the postage rates are due to go up soon, so the cost of the stamp will change when it does.
