exam Maths Puzzle Numerical Ability

My question is about the halflife. the question is "radiun-228 has a half like of 5.75 years. What is the decay rate for radiun-228?"
It's not so much of finding how something dep

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The section of a patchwork quilt is 12cm square witj 5 triangles on it. The base of each triangle is 5.2 cm ad the height is 3.6 cm

A what area of fabric is needed for this tri Gary has figured that he needs to take home $30,400 a year to live comfortably. If the government gets 24% of Garys income, then what must his income be for him to live comfortabl