Can someone help me on this question?

x = 19.6

Step-by-step explanation:

By applying cosine rule in ΔBCD,

cos(30)° =

              =

BC =

Now, by applying sine rule in ΔBAC,

sin(45)° =

x =

x = 19.59

x ≈ 19.6  

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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