Answer:
5
Step-by-step explanation:
First do substitution,
Which means |(4)-3|+4
Therefore 1+4=5
630/105=6 minutes per dish
630/70=9 minutes per dish
15 minutes:2 dishes
630/15=42
It will take them 42 minutes to rinse 630 dishes together.
Because BA ≅ BC, we know the triangle is isosceles. Because ∠FEC=90°, we know BE is a median and angle bisector of ∠ABC.
Hence ...
... AC = 2×AE = 20 in
... ∠EBC = (1/2)×∠ABC = 65°15'