Tell me if this is right

The table above shows approximate conversions from gallons to liters. what is the value of x?

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6