Kayla did her homework as soon as she got home from school, it took her 2/3 of an hour, how many minutes did it take her to do her homework? you need a step by step explanation ​

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.