exam Maths Puzzle Numerical Ability

2(-5)-3(-4)
I tied doing this one in a line, but I came up with 28, which is not one of the options for the answer.

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I need help with linear model

the cost of producing 4 units is 204.80 the cost of producing 8 units is 209.60 how much does it cost to produce 12 units
grapg the functions y = x and y = square root of x on the same grapg by plotting points if necessary. show the points of intersection of these two graphs.