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Ostrovityanka [42]

3 years ago

12

The scores of adults on an IQ test are approximately Normal with mean 90 and standard deviation 18. An organization requires an

IQ score of 126 or higher for membership. What percent of adults would qualify for membership?

1 answer:

ICE Princess25 [194]3 years ago

5 0

The answer is .0228. Let me know if this helps

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You have P = 472 feet of fencing to enclose a rectangular plot that borders on a river. If you do not fence the side along the r

Ray Of Light [21]

The width would be 236 and the lengths would be 118

Use the equations 2L+W=472 and W*L=MAX
Change the first equation to W=472-2L and plug this into the other equation
(472-2L)(L)=MAX
472L-2L^2=M (take derivative)
472-4L=0 (set to 0 to find the max value)
4L=472
L=118
Plug into original to get W=236

Hope this helps!

4 0

3 years ago

Find the discriminant and determine the nature of the roots to the quadratic equation

Katen [24]

№17
$x^{2} +6x-7=0 \\ D=6 ^{2} -4*(-7)=36+28=64=8 ^{2} \\ \\ x_{1} = \frac{-6+8}{2} =1 \\ \\ x_{2} = \frac{-6-8}{2} =-7$
Answer: x₁ = 1
   x₂ = - 7

№18
$2 x^{2} -3x+4=3 \\ 2 x^{2} -3x+4-3=0 \\ 2 x^{2} -3x+1=0 \\ \\ D= -3 ^{2} -4*2=9-8=1 \\ \\ x_{1} = \frac{3+1}{2*2} = \frac{4}{4} =1 \\ \\ x_{2} = \frac{3-1}{2*2} = \frac{2}{4} =0.5$
Answer: x₁ = 1
     x₂ = 0,5.

№19
$2 x^{2} -4x-5=0 \\ D=-4 ^{2} -4*2*(-5)=16+40=56 \\ \\ x_{1}= \frac{4+ \sqrt{56} }{2*2} = \frac{4}{4} + \sqrt{ \frac{56}{16} } =1+ \sqrt{3.5} \\ \\ x_{2} = \frac{4- \sqrt{56} }{2*2} = \frac{4}{4} - \sqrt{ \frac{56}{16} } =1- \sqrt{3.5} 
$
Answer: x₁ = 1 + √3.5
     x₂ = 1 - √3.5

3 0

3 years ago

Cuantos números primos hay entre 30 y 40?

max2010maxim [7]

Answer:

Dos numeros primos

Step-by-step explanation:

31 y 37 no son productos de dos números naturales más pequeños. Los otros numeros entre 30 y 40 son compuestos.

6 0

2 years ago

|v|>3 solution to the inequality on the number line

Andrew [12]

On a number line, v would be all the numbers to the left of -3 (for example, |-4|=4 which is greater than 3) and all the values to the right of positive 3. Since it can't equal 3, v=-3 and v=3 are not included on the number line.

3 0

3 years ago

The pair of points is on the graph of an inverse variation. Find the missing value.

rosijanka [135]

Answer:

The answer is 2

Step-by-step explanation:

7 0

2 years ago