(d) Solve these simultaneous equations. 3a + 4b =-13
5a + 6b = -11
Can anyone solve this .. clearly for me...with explanations please​

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.

If mary had 320 toy cars and she gave her friend 50 cars and then she gave her brother 72 more cars how much toy cars would mary have left ● explain with proper details