Ateacher gave a test with 50 questions, each worth the same number of points. donovan got 40 out of 50 questions right. marci's score was 90%. how many more questions did marci answer correctly?

Sienna planned a trapezoid-shaped garden, as shown in the drawing below. she decides to change the length of the top of the trapezoid-shaped garden from 32 ft to 24 ft. which expression finds the change in the scale factor?

Could somebody me with this radical simplification?

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.