4.2 In 1 ABD. BA is produced to F. AC is drawn with C on BD such that A = A: = x. CEDA with E on AB.
F
IST
A
Area
D
E
С C
B
(3)
4.2.1 Give, with reasons, two more angles equal to x.
BD BA
4.2.2 Prove that
DC AC
(13)​

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z

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