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13. OACB is a parallelogram. overrightarrow (OA)=a and overrightarrow (OB)=b The points M, S N and T divide OB, BC, CA and AO in the ratio 1:4 respectively. The lines ST and MN intersect at the point D. (a) Express overrightarrow (MN) n terms of a and b. (b) Express overrightarrow (ST) in terms of a and b. (c) Show that the lines MN and ST bisect one another. (2) (2) (9) (Total 13 marks)

Which expression gives the distance between the points (1,-2) and (2,4) A. sqrt ((1+2)^2+(2-4)^2) B (1-2)^2+(-2-4)^2 c (1+2)^2+(2-4)^2 D. sqrt ((1-2)^2+(-2-4)^2)

Drag and drop the correct answer choice to each answer blank. What are the x and y values in the solution to this system of equations? 3x+y=19 x-2y=4 Move the correct answer to each box. (3)/(4) x value: square y value: square

Simple Present (interrogative) 1. Write questions as in the example. 1. You/speak English. 2. She/work hard. Do you speak 3. They/have dinner at eight 4. Jill and Tom / study at university 5. You/do your homework every day 6. John/watch TV after dinner. 7. He/wash the car at the weekend. 8. Her friends I live in London. 9. You/have any brothers or sisters. 10. Your friends /go to the cinema very often.

Question 3 of 10 Which key difference do experiments have that correlation studies do not have? A. The sample size is much larger, allowing for better proof of causation. B. At least one variable must be discrete. C. The sample is drawn randomly from the population. D. The researcher makes a change in one of the variables to see what is affected.