To estimate the sum of two mixed numbers, Grace rounds one number to 7 and the other number to 4. Which could be the number she rounds to 7?
A. 7 5/9
B. 7 11/15
C. 6 2/5
D. 6 9/14

Y=4x^2+x-1 solve using quadratic formula

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

An account with a $250 balance accrues 2% annually. if no deposits or withdrawals are made, which graph can be used to determine approximately how many years will it take for the balance to be $282? it's e2020 ni️️as