yaekob

an express train makes a run of 240 km at a certain speed. another train whose speed is 12km/hr less takes an hour longer to cover the same distance. find the speed of the express train in km/hr.

A child of mass 40kg jumps off a wall and hits the ground at 4m/s.He bends his knees and stops in 1s.Calculate the force required to slow him down.How would this force be d/t if he didn't bend his knees and stopped in 0.1s?

a)what are the main similarities b/n cholera and typhoid? b)what are the main d/ce b/n cholera and typhoid? c)how can the spread of cholera and typhoid be prevented as far as possible?

58-(-88)= 146

step 1) 1/(ax^2+bx+c)=0*1/a x^2+b/a(x)=-c/a x^2+b/a(x)=-c/a step2) add {1/2*b/a}^2=b^2/4a to both sides:x^2+b/a(x)+b^2/4a=b^2/4a-c/a=b^2-4ac/4a^2 step3) x^2+b/a(x)+b^2/4a write as {x+b/a}^2=b^2-4ac/4a^2 x=-b+or- *square root of b^2-4ac/2a. you get the gen...