There are 35 cars in the parking lot. 12 cars are black, 10 are silver, 5 are blue, 5 are white and 3 are green. If two cars are selected at random, what is the probability that both cars are black? Please write your answer in fraction form. IOO POINTS TO WHO EVER ANSWERS THIS AND BRAINEST ANSWER IF CORRECT WITH REASONING

If (a, b) is the solution to the system of equations shown above, and a and b are integers, then what is the value of a+b?

Scientists observed a rock stratum and discovered some fossils. the image shows the fossils they discovered. what can you interpret from the image? an illustration showing layers rock with fossils embedded in some rock layers1. the dinosaur and the mammoth existed after the trilobites.2. the dinosaur and the armored fish existed before the trilobites.3. the trilobites and the armored fish died before the dinosaur.4. the trilobites and the armored fish were born after the dinosaur.5. the early mammoth is older than the trilobites.

When do you think it’s best to take the psat (what grade year / when in the year)?