Find a value of k for which the following system has only one solution: 2x+y=7 y−kx=3 you will be awarded 30 points!

20 solve 2(4 x + 3) < 5 x + 21. a) { x | x < 9} b) { x | x > -5} c) { x | x > -9} d) { x | x < 5}

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

You have 37 coins that are nickels, dimes, and pennies. the total value of the coins is $1.55. there are twice as many pennies as dimes. find the number of each type of coin in the bank.