Answer:

Step-by-step explanation:
Let
blank (for convenience)

(change
into its decimal form)
(divide
on both sides)

∴ Blank = 50
Hope this helps :)
Answer:
140 square cm
Step-by-step explanation:
7×4×5 =140 this is the answer to yoir question
Answer:
292 in² (3 s.f.)
Step-by-step explanation:
The figure is made up of 2 semicircles and a rectangle.
Please see attached picture for full solution.