Item 2 Find the unit rate. 6 2/5 revolutions in 2 2/3 seconds The unit rate is revolutions per second.

1 answer:

4 0

Divide the number of revolutions by the number of seconds.

(6 2/5) / (2 2/3) =

Rewrite each mixed numeral as a fraction.

= (32/5) / (8/3)

= 32/5 * 3/8

= 96/40

= 12/5

= 2 2/5

Answer: 2 2/5 revolutions per second

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If the given values in a right triangle are cos A =

Vlad1618 [11]

See the picture attached to better understand the problem

we know that
in the right triangle ABC
cos A=AC/AB
cos A=1/3
so
1/3=AC/AB----->AB=3*AC-----> square----> AB²=9*AC²----> equation 1

applying the Pythagoras Theorem
BC²+AC²=AB²-----> 2²+AC²=AB²---> 4+AC²=AB²----> equation 2

substitute equation 1 in equation 2
4+AC²=9*AC²----> 8*AC²=4----> AC²=1/2----> AC=√2/2
so
AB²=9*AC²----> AB²=9*(√2/2)²----> AB=(3√2)/2

the answer is
the hypotenuse is (3√2)/2