I have tutor at 9pm plz help what is the cost of painting a wall 30m x 2m, when the painting costs £15 a litre covers 12m^2

Will give brainliest sum of arithmetic series (sigma notation) find the numerical answer to the summation given below. (image shown below)

The measure of angle 0 is 600 degrees

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.