Achemist claims that he has found a chemical formula that will kill a certain bacteria. he claims it will kill half the bacteria in 40 seconds, and in the next 40 seconds kill half of the remaining half, and so on. if he is correct, and at a certain time there are 30 bacteria still alive, how many bacteria were alive 4 minutes earlier? explain clearly

Use the following statements to write a compound statement for the conjunction or disjunction. then find its truth value. p: an isosceles triangle has two congruent sides. q: a right angle measures 90° r: four points are always coplanar. s: a decagon has 12 sides. a) a right angle measures 90° or an isosceles triangle has two congruent sides; true. b) a right angle measures 90° and an isosceles triangle has two congruent sides; true. c) a right angle measures 90° and an isosceles triangle does not have two congruent sides; false. d) a right angle measures 90° or an isosceles triangle does not have two congruent sides; true.