Of the 20 students in the math club 40% are 6th graders how many students in the math club are 6th graders?

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given

Layla answer 21 of the 25 questions on his history test correctly.what decimal represents the fraction of problem he answer incorrectly.