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zimovet [89]
3 years ago
15

Write the expression (4X -2)•6(2X +7)in the standard form of a quadratic expression

Mathematics
1 answer:
deff fn [24]3 years ago
3 0
(4x - 2) x (12x +42)  (I distributed the 6 over the 2x and the 7)

Using the FOIL method
First terms  (in each parenthesis) 4x  times 12 x = 48x²
Outer terms  4x times 42 = 168x
Inner terms    -2  times 12 x = -24x
Last terms -2 times 42 = -84

So we have 48x² + 168x + 168x - 24x -84
Finally combine like terms:

48x² + 144x - 84    There's your quadratic expression 
 
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The annual precipitation amounts in a certain mountain range are normally distributed with a mean of 91 inches, and a standard d
Vesna [10]
The sample std. dev. will be (14 inches) / sqrt(49), or (14 inches) / 7, or 2 inches.

Find the z score for 93.8 inches:
       93.8 inches - 91.0 inches          2.8 inches
z = ------------------------------------- = ----------------- = 1.4
                    2 inches                         2 inches

Now find the area under the standard normal curve to the left of z = +1.4.

My calculator returns the following:

normalcdf(-100,1.4) = 0.919.  This is the probability that the mean annual precipitation during those 49 years will be less than 93.8 inches.
 
4 0
3 years ago
Okay so I think I got it right, I just need someone to check over it.
Paladinen [302]

Answer:

yes

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
101
Anna35 [415]

Answer:

second option

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

Here (h, k) = (4, 5) and r = 2 , thus

(x - 4)² + (y - 5)² = 2², that is

(x - 4)² + (y - 5)² = 4 ← equation of circle

3 0
3 years ago
How do you find the slope of x^2 at x = 5? please hurry
Lorico [155]

The slope of any function is its first derivative.

If  f(x)=x^2, then  f'(x)= 2x .

At  x=5,  slope = f'(x) = 2(5) = <em>10</em> .
5 0
3 years ago
13/17% of a quantity is equal to what fraction of the quality
Nookie1986 [14]

Answer:

13/1700

Step-by-step explanation:

so you do 13/17 x 1/100 which is 13/1700 please mark brainliest

8 0
3 years ago
Read 2 more answers
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