Evaluate and match each expression on the left to its value on the right, when x = 7 and y = 4. 12 + x
6.
3x + y
14
4y - 10
25
19

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Ascientist has discovered an organism that produces five offspring exactly one hour after its own birth, and then goes on to live for one week without producing any additional offspring. each replicated organism also replicates at the same rate. at hour one, there is one organism. at hour two, there are five more organisms. how many total organisms are there at hour seven? 2,801 19,531 19,607 97.655

Julie buys 2kg of apples and 7kg of pears ? 12.70. the pears cost ? 1.30 per kilogram what is the price per kilogram of the apples? show your working out