Can someone help me plz

20x+45=225

what is x

What is the value of this expression when b= 5 6 (2b-4)

Find the equation of the line that goes through the points (4, –1) and (2, –5). use slope formula,equation,to find the slope of a line that passes through the points. m = use slope-intercept form, y = mx + b, to find the y-intercept (b) of the line. b = write the equation in slope-intercept form, y = mx + b.

What is the volume of this square pyramid?