Step-by-step explanation:
no. if you simplify 21:24 down you would not get 2:4
Whatever... I'll try to solve the first two problems.

1.

One solution is
, and
, therefore
.
We can ignore other possible solutions of the polynomial equation, because the expression can not be equal to two different values simultaneously.
The length of one side is 4 V= a^3 so 4^3 is 64
<span>Triangle ABC is congruent to triangle DEF
</span>m<A = m<span><D
</span>m<B = m<span><E
</span>m<C = m<span><F
AB = DE
BC = EF
AC = DF
So answer:
</span>m∠C=m∠F
It can be written as (15+2)x