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the angle is 120 degrees.
52 is 40% of 130. The equation to use is 52/ .40(40%)= 130.
The formula looks like trans- 2-butene. The c atoms working left to right will have sp3 sp2 sp2, sp3 hybridisation. the bond angles will be tetrahedral on the sp3 centers, 120 0 on the sp2 centres which have a planar shape, with all four substituents lying in the same plane. Good picture in wikipedia. The actual bond angles will deviate slightly.
yes the pattern of multiplying binomials. 42 = (40 + 2) and 38 = (40 - 2) so 42 x 38 = (40 + 2)(40 - 2) => use the pattern of the difference of squares = 402 - 22 = 1600 - 4 = 1596
use compatible numbers to estimate each difference 84-36