Answer:
x= −1/2 or x=4
Step-by-step explanation:
This is ALGEBRA, equations, factoring and zero property. ok.. let's solve this step-by-step
2x^2−7x=4
Step 1: Subtract 4 from both sides.
2x^2−7x−4 =4 −4
2x^2−7x−4=0
Step 2: Factor left side of equation.
(2x+1)(x−4)=0
Step 3: Set factors equal to 0.
2x+1=0 or x−4=0
x= −1/2 or x=4
(BTW, there are supposed to be two answers, it's factoring)
Sorry if the format is not clear, but I hope this helped (really feel you, algebra can be brain-striking)!! Please leave a comment, rating and/or mark as the brainliest-whichever you think I deserve! Thank You :)
3/8 + 2/5
Answer:
31/40
Step-by-step explanation:
1) a^2- 9a + 14 = 0
Answer:
0.4772
Step-by-step explanation:
Mean =
Standard deviation =
Now we are supposed to find the probability that a randomly selected score lies between 500 and 700.
Formula :
At x = 500
At x = 700
Now to find P(500<z<700)
P(0<z<2) =P(z<2)-P(z<0)
Now using z table :
P(z<2)-P(z<0) =0.9772-0.5000=0.4772
Thus the probability that a randomly selected score lies between 500 and 700 is 0.4772.