3 1/4-2 1/2a+3(3a-2) what is the simplified form of this equation?

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.

Miguel has 334 baseball cards and 278 football cards. he says, i have 612 cards in all. is that reasonable? explain using the words round and estimate.