The amount of radioactive uranium changes with time. the table below shows the amount of radioactive uranium f(t) left after time t:

t(hours) 0 0.5 1
f(t) 100 50 25

which exponential function best represents the relationship between f(t) and t?

a).f(t) = 100(0.25)t

b).f(t) = 0.25(100)t

c).f(t) = 100 (0.5)t

d).f(t) = 0.25(50)t

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)