Can anyone help me with my homework

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°

What percent of 18 is 24? and plz explain thx.