ABCD is a quadrilateral. a) Calculate the value of x.
A = 2x
B = 90 Degrees
C = X
D = 3x

360 - 90 = 270
270 ÷ 3 = 90
270 ÷ 2 = 135
135 - 90 = 45

x = 45 Degrees

This is an answer to the question

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

the first option is the answer.

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.