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slope is 2/3

Step-by-step explanation:

To solve for slope: y2-y1 / x2- x1.

Two points can be (0,50) and (30,70) since they intercept.

70-50 / 30- 0 = 20/30 = 2/3.

The slope is also going 20 units up and 30 units across which gives you 2/3.

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.