Learning Task 2: Give the missing number in the equation below. 1.6+ = 5 + 6
2. (9×_)×4=×(2×4)
3.(1 x 4) x 0 = x (_x 0 )
4. 17 + = 19 + 17
5. (13+6)+7=13+(+)

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Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

How many moles of al3+ ions are in 1.25 moles of al2o3