Exam-style question a
An alloy is made from a mix of copper and
tin. The density of copper is 8.94 grams per
cm3. The density of tin is 7.3 grams per cm.
500 cm3 of the alloy is made from 360 cm3
of copper with 140 cm3 of tin.
Work out the density of the alloy to 3 s. f.

Which expression is equivalent to 2x^2+7x+4?

Tamera puts 15/4 gallons of gasoline in her car. which mixed number represents the gallons of gasoline? a) 2 3/4 gallons b) 3 1/4 gallons c) 3 3/4 gallons d) 4 1/2 gallons answer it's worth a lot of points!

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.