If n represents a number, then write an expression for a number that is twice n Help please its for algebra class please help thank you a lot like thanks u guys save my day

It’s pre algebra class

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?

The square root of 9x plus 7 plus the square rot of 2x equall to 7