Answer:
70.7
Step-by-step explanation:
(25x^2 − 14xy + 4) − (7x^2 − 9y) + (2xy + 7)
= 25x^2 − 14xy + 4 − 7x^2 + 9y + 2xy + 7
= 18x^2 - 12xy + 9y + 11
Hope it helps.
You have to make the denominTors even, in this. Case it is 30. So you mutiply the 4 by 3 because you mutiply true 10 by 3 to get 30. So that fraction is now 12/30. Then mutiply the 2 by 2 because the 15 gets multiplied by 2 to get 30. So your equation is now 12/30 - 4/30. And you solve that to make 8/30. Simplify it to get 4/15. 4/15 is the answer. Hope this helps.
7.2
if she can ride 1.5 mi in 5 min then she can ride 0.3 mi each minute, multiply 0.3 times 24 minutes and it gets 7.2 miles
