How do I solve this?

The equations are
5a+7s=25
2a+3s=10.5

Can someone me with the property questions for 12 13 and 14 plz

If you are dealt 4 cards from a shuffled deck of 52? cards, find the probability that all 4 cards are diamondsdiamonds.

Type the correct answer in each box. spell all the words correctly, and use numerals instead of words for numbers. if necessary, use / for the fraction bar(s).