In an examination 70% passed economics and 65% passed history, each student passed at least one of the two subjects 1) what percentage of students passed in both subjects

2) if the number of students in the class is 80 how many passed in both subjects

there are many solutions.

step-by-step explanation:

step 1: simplify both sides of the equation.

4x+6=4x^2+10x−4

step 2: subtract 4x^2+10x-4 from both sides.

4x+6−(4x^2+10x−4)=4x^2+10x−4−(4x^2+10x−4)

−4x^2−6x+10=0

step 3: factor left side of equation.

−2(2x+5)(x−1)=0

step 4: set factors equal to 0.

x=-5/2 or x=1

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.

50-60=10

step-by-step explanation:

the answer is  

a.

28 ft2

step-by-step explanation: