Apropeller rotates 6 times every 15 seconds. based on this information, which of the following could not be true?

a. the propeller rotates 30 times in 90 seconds.
b. the propeller rotates 24 times in one minute.
c. the propeller rotates 18 times in 45 seconds.
d. the propeller rotates 12 times in 30 seconds.

1^3 + 2^3 + 3^3 +4^3 = (1+2+3+4)^2

step-by-step explanation:

i am only able to answer the first part. i am not sure about the second part. sorry

the circumference of a circle is, 10.676 cm.

step-by-step explanation:

the formula for circumference of a circle is given by:

where

c is the circumference of a circle and

d is the diameter of a circle.

given: diameter(d) = 3.4 cm and use

substitute these values in [1] we get;

cm

therefore, the circumference of a circle is, 10.676 cm