Consider all seven-digit numbers that can be created from the digits 0-9 where the first and last digits must be odd and no digit can repeat. What is the probability of choosing a random number that starts with 3 from this group

Pls! does anybody know a shortcut for answering these types of questions in the future?

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36