Ametronome is a device that ticks at adjustable intervals to keep time when playing music. the metronome on ryan’s piano has the basic shape below. if the metronome was created out of a piece of solid wood, what is the minimum amount of solid wood that was used?

a. 369 cm
b. 450 cm
c. 540 cm
d. 810 cm
answer asap- this is timed ; -;
worth 25 points

Estimate the product. round the first factor to the nearest whole number, round the second factor to the nearest ten, and then multiply. 3 8/9 × 96

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.