At the gift shop, they sell small greeting cards and large greeting cards. The cost of a small greeting card is $ 2.50 and the cost of a large greeting card is $3.85. How much would it cost to get 4 small greeting cards and 5 large greeting cards? How much would it cost to get small greeting cards and y large greeting cards ?

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

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.