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1.) 20+3³-24÷2×5²

2.) 77÷11+7²+1

3.) 25-8²+3×2³

Find the value of x for which the lines are parallel.

What is the number 321,000,000 in scientific notation? also what is the number? ?

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.