A question paper is made up of twelve questions. A student attempted only 25% of the questions, how many questions were
left untouched?

9

Step-by-step explanation:

25%=1/4

1/4 of 12 = 3

you can get this by multiplying 1/4*12=3

and then substract: 12-3 =9

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

18.75 gallons

step-by-step explanation: