Sid painted 10 portraits every 30 hours at the rate how long will it take to paint three portraits

9 hours

Step-by-step explanation:

10 portraits in 30 hours, let's write it mathematically

10p=30h   then 1p=(30/10)h= 3 h  three hours for a single portrait

therefore for 3 portraits he will take three times 3 hours

3p=3*3h = 9 hours

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer

if you was gonna solve for a, a is a   < -12