Solve the quadratic equations y^2 −10y+21=0
y=?

16p^2 -8p=-1
p=?

x^2 -400=0
x=?

-16m^2 =8m+1
m=?

-3n^2 +75=0
n=?

If angle b measures 25°, what is the approximate perimeter of the triangle below? 10.3 units 11.8 units 22.1 units 25.2 units

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?

Andres wants to share 1/2 of his birthday cake with his friends. if he has 8 friends, how much of the cake will each friend recieve? draw a model to support your work (its ok if you cant)