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3 years ago

PLEASE HELP ME PRONTO!!!!!! Kanisha cut purple paper strips for her scrapbook. She cut a 7 and 1/2

Mathematics

1 answer:

maria [59]3 years ago

5 0

Answer
6 and 1/2
Work
14-7 and 1/2= 6 and 1/2

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An educational psychologist wishes to know the mean number of words a third grader can read per minute.

Rama09 [41]

Answer: 208.

Step-by-step explanation:

The formula to find the minimum sample size is given by :-

$n= (\dfrac{z^*\times \sigma}{E})^2$ (1)

, where z* = critical z-value (two tailed).

$\sigma$ = Standard deviation ( from prior study ) and E = Margin of error.

As per given , we have

Margin of error : E= 0.29

Confidence level = 85%

Significance level = $\alpha=1-0.85=0.15$

Using z-table , the critical value (two -tailed)= $z^*=z_{\alpha/2}=z_{0.15/2}=z_{0.075}=1.439$

As per previous study , Variance = $\sigma^2=8.41$

$\sigma=\sqrt{8.41}=2.9$

Now, the required minimum sample size = $n= (\dfrac{(1.439)\times (2.9)}{0.29})^2$ [Substitute the values in formula (1)]

$n=(14.39)^2$

$n=207.0721\approx208$ [ Round to the next integer]

Hence, the minimum number of third graders that must be included in a sample = 208.

5 0

4 years ago

2. Which equation represents y=-x2 - 10x-20 in vertex form?

Naily [24]

Answer:

$\large\boxed{y=-(x+5)^2+5}$

Step-by-step explanation:

The vertex form of a quadratic equation <em>y = ax² + bx + c :</em>

y = a(x - h)² + k

(h, k) - vertex

We have the equation

$y=-x^2-10x-20$

Convert to the vertex form:

$y=-x^2-2(x)(5)-20$

$y=-x^2-2(x)(5)-5^2+5^2-20$

$y=-(\underbrace{x^2+2(x)(5)+5^2}_{(*)})+25-20$ <em>use (a + b)² = a² - 2ab + b²</em>

$y=-(x+5)^2+5$

8 0

3 years ago

Deangelo has a certain number of apples. He places 9 of them in each 4 baskets. Which equation could be used to find the total n

algol [13]

Multiplaction. 9×4=36. 36 apples (Unit)

6 0

3 years ago

The triangle and the rectangle

Anettt [7]

Step-by-step explanation:

1/2 * (6*5) = 6w

30=12w

w=2.5

6 0

3 years ago

Craig has £13.40

strojnjashka [21]

Yes
Step-by-step explanation:
Full price for first course: £8.90
Half price: £4.45
One and one half times
full price is then: £13.35
Since this is less than Craig's £13.40, he can just barely afford to buy two main courses at these prices.

3 0

3 years ago