A bag contains 8 blue and 3 red counters. Two counters are removed, without replacement.

Draw a tree diagram and use it to calculate the probability that at least one of the counters is red.

Write your answer as a fraction

Can (2,3 and square root 10) be sides ona right triangle?

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).

What expression is equivalent to 42x-56y