Expand the following. In other words, remove the parentheses (brackets): 7x(3y - 4x + 2)
A 21xy - 28x2 + 14
B 21xy - 282 + 14
C21xy - 28x2 + 14x
D 21xy + 28xz + 14x

Kelly is three years younger than her sister. the sum of their ages is 34 years. how old is kelly and how old is her sister?

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.