Find the perimeter of a rectangle with a length of 3.5 meters and a width of 8 meters.
(P=21+2w)

23

Step-by-step explanation:

the formula to calculate perimeter of a rectangle is 2(l+b) so its answer will be 23

perimeter of rectangle

=2(l+b)

=2(3.5+8)

=2(11.5)

=23meters

3/4 ÷ 3/4

step-by-step explanation:

basically divide any proper fraction with itself to fit the criteria.

so if we are using 3/4, then:

3/4 ÷ 3/4 = 1

so 1 is the quotient.

and the numerators for both these fractions is 3.   and if we divide the numerators:

3 ÷ 3 = 1

we see that quotient is equal to our original quotient as well.

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)