What is the value of (
4
−
1
4
)
÷
(
2
−
1
2
)
?

Step-by-step explanation:

(4-14)÷(2-12)=-10÷-10

                  = 1

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons