Question

1. Solve 16+14÷2+3⋅5−11

O 75

O 79

O 27

O 23


2. A group of scientists are providing an experiment on simultaneous tossing of 5 coins. The result of the experiment is the final amount of tails that will drop out. How many possible consequences can be at the end of this experiment?

O 10

O 5

O 3

O 6

Answer 1

1. 27

2.6

Explanation:

1.

remember the priorities of operations :

1. brackets

2. exponents

3. multiplications and divisions

4. (and truly last) additions and subtractions

so,

16 + 14÷2 + 3×5 - 11 =

16 + 7 + 15 - 11 = 23 + 4 = 27

2.

5 coins are tossed at the same time.

each coin has a result (head or tail).

but the observed event is the sum of all tails that show when tossing the 5 coins.

so, the possible outcomes are

0 tails

1 ...

2 ...

3 ...

4 ...

5 tails

so, in total, 6 different possible outcomes.