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3 years ago

A=3x^2-2(x-y)^2-3y^2 tại x=4,y=-4

Mathematics

1 answer:

Andrei [34K]3 years ago

7 0

Answer:a=-128

Step-by-step explanation:

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Lena is a college basketball player who has made 75\%75%75, percent of the free-throws she has attempted in her career. She deci

joja [24]

Answer:

The alternate hypothesis statement is, p ≠ 0.75.

Step-by-step explanation:

Success rate for Lena at free throws in a basketball game is, p = 0.75.

She decided to practice a new technique for shooting her free-throws.

Lena attempted n = 50 free throws. Of these 50 free throws her success rate was, $\hat p=0.70$ .

To test whether the new technique produced significantly better or worse results she should use one-proportion z-test.

The hypothesis can be defined as:

H₀: The proportion of attempts made using this new technique is 75%, i.e. p = 0.75.

Hₐ: The proportion of attempts made using this new technique is different from 75%, i.e. p ≠ 0.75.

The alternative hypothesis indicates that the test is two-tailed.

This is because Lena is not sure if the new technique increases her success rate or decreases it.

Thus, the alternate hypothesis statement is, p ≠ 0.75.

8 0

3 years ago

(6-4)/5×100=40 step by step

Fynjy0 [20]

(6-4)/5x100=

First take mind in PEMDAS or do the equation in the order of parenthesis, exponents, multiplication, division, addition, subtraction.

So first parenthesis or (6-4)=2

2/5x100

There are no exponents, so now we must do the multiplication or 5x100=500

2/500

now we do division or 2/500=0.004

There-forth the answer is actually 0.004 and not "40"

4 0

3 years ago

(x-19)/2=(x-7)/1 step by step please

Maksim231197 [3]

Answer:

X=-5

Step-by-step explanation:

Since anything divided by one is still that number, then (x-7)/1 becomes x-7. So our equation now looks like:

(X-19)/2=(x-7).

Multiplying both sides by 2, we get

X-19=2x-14

Adding 19 to both sides:

X=2x+5

Subtract 2x from both sides:

-x=5

Multiplying both sides by -1, we get:

X=-5

6 0

4 years ago

Jose is purchasing 4 dress shirts that cost $28 each and 2 pairs of pants that cost $38 each. The items are all on sale for 35%

Alenkasestr [34]

I believe your awnser would be 65.8

4 0

3 years ago

Read 2 more answers

Prove or disprove that (1)/(1-cot x) is the same as (sin x)/(sin x - cos x)

SIZIF [17.4K]

$\dfrac{1}{1-\cot x}=\dfrac{\sin x}{\sin x-\cos x}\\\\L_s=\dfrac{1}{1-\dfrac{\cos x}{\sin x}}=\dfrac{1}{\dfrac{\sin x}{\sin x}-\dfrac{\cos x}{\sin x}}=\dfrac{1}{\dfrac{\sin x-\cos x}{\sin x}}=\dfrac{\sin x}{\sin x-\cos x}=R_s$

$\text{Used:}\\\\\cot x=\dfrac{\cos x}{\sin x}$

7 0

3 years ago