Add parentheses to the expression so that its value is 45:

5 × 4 + 8 - 3

5 × (4 + 8 - 3)
5 × (4 + 8) - 3
5 × 4 + (8 - 3)
no parentheses are needed

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

What does the sign of the slope tell you about a line?

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota