Please help me with this khan academy question

Area = 76.93 units²

Step-by-step explanation:

Area of a semi-circle = r²/2

Radius = d/2 = 14/2 = 7

Area of semi-circle = 7²*/2 = 49/2 = 153.86/2 = 76.93

So, the area of the semi-circle is 76.93 units²

answer: my brother can figure it out, imma go get him so i can answer : ) edit: my brother is sleeping, sorry man

step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional