Answer:
More than 5 times
Step-by-step explanation:
There are 10 options for the last digit (0, 1, 2.....9)
Probof 0.5 means 50% chance of getting it right,
Which would happen when he has tried 50% of the total possibilities, which are 10
50% of 10 = 5
He'll have to dial 5 times for a probability of 0.5.
More than 5 times for a probability of more than 0.5
55
3(9-5)^2 ÷8
3(4)^2÷8
3(16)÷8
3(2)=6
8x² + 6xy - 4
(5x² + 4xy - 7) + (3x² + 2xy + 3) ← remove parenthesis
= 5x² + 4xy - 7 + 3x² + 2xy + 3 ← collect like terms
= 8x² + 6xy - 4
Answer:$1.08 cents.
$6 - $4.52 = $1.08.
