The diagram shows a cuboid
AB=10 cm
BC = 8cm
A string runs diagonally across the box from H to B and is 25cm long
calculate the length of A and E
give your answer correct to 3 significant figures

AE=21.47

Step-by-step explanation:

trg ABD I apply the Pitagorean Theoreme

BD^2=10^2+8^2=100+64=164

trg  HDB I apply the Pitagorean Theoreme

DH^2+BD^2=BH^2

DH^2+164=25^2

DH^2+164=625

DH^2=625-164=461

DH=V461=21.47

AE=DH=21.47

the equation for this situation is y=122+45. to solve the equation you would add 45 and 122 to get a total of 167lbs. in conclusion, grace's weight eight weeks ago was 167lbs.  

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.