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4 years ago

The diameter of a baseball is about 1.4 in.

1 answer:

3 0

You need to find the surface area and the volume. The formula for surface area is 4*3.14(pi)*radius^2 which is equal to 6.5144 inches^2 in this case. The amount of rubber needed to fill it is equal to the volume. The formula for volume of a sphere is 4/3*3.14(pi)*radius^3, just plug in the number (remember radius is half of diameter) and that will give you the answer!

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Iii. Divide and simplify if possible. 7) 5V2u y2 V 18uv4 8) 3V 50x’y V2.xy

Luden [163]

Ummm let’s see......

3xy(1/3)

7 0

3 years ago

6x - 5 = 2 Times 3x + 4

Simora [160]

Answer:

no solution

Step-by-step explanation:

u cant multiply when there is an equal

5 0

4 years ago

Read 2 more answers

the ratio of red to blue to green marbles is 3:10:4 if there are 39 red and blue marbles altoghether how many green marbles are

Alla [95]

Answer:

3r 10b 4g

red + blue = 39

there are 9 red marbles and 30 blue marbles

green marbles = 30 * 4 / 10 = 12

Step-by-step explanation:

6 0

2 years ago

Tensile-strength tests were carried out on two different grades of wire rod. Grade 1 has 10 observations yielding a sample mean

earnstyle [38]

Answer:

$t=\frac{(1085 -1034)-(0)}{57.646\sqrt{\frac{1}{10}+\frac{1}{15}}}=2.167$

$p_v =2*P(t_{23}$

We see that the p value is lower than the significance level provided of 0.05 so then we have enough evidence to conclude that the true means are different at 5% of significance.

Step-by-step explanation:

Data given

$n_1 =10$ represent the sample size for group 1

$n_2 =15$ represent the sample size for group 2

$\bar X_1 =1085$ represent the sample mean for the group 1

$\bar X_2 =1034$ represent the sample mean for the group 2

$s_1=52$ represent the sample standard deviation for group 1

$s_2=61$ represent the sample standard deviation for group 2

We are assuming that the two samples are normally distributed with equal variances and that means:

$\sigma^2_1 =\sigma^2_2 =\sigma^2$

System of hypothesis

Null hypothesis: $\mu_1 = \mu_2$

Alternative hypothesis: $\mu_1 \neq \mu_2$

The statistic is given by:

$t=\frac{(\bar X_1 -\bar X_2)-(\mu_{1}-\mu_2)}{S_p\sqrt{\frac{1}{n_1}+\frac{1}{n_2}}}$

The degrees of freedom are given by:

$n_1+n_2 -2$

And the pooled variance is:

$S^2_p =\frac{(n_1-1)S^2_1 +(n_2 -1)S^2_2}{n_1 +n_2 -2}$

Replacing we got:

$S^2_p =\frac{(10-1)(52)^2 +(15 -1)(61)^2}{10 +15 -2}=3323.043$

And the deviation would be:

$S_p=57.646$

The degrees of freedom are:

$df=10+15-2=23$

The statistic would be:

$t=\frac{(1085 -1034)-(0)}{57.646\sqrt{\frac{1}{10}+\frac{1}{15}}}=2.167$

The p value would be

$p_v =2*P(t_{23}$

We see that the p value is lower than the significance level provided of 0.05 so then we have enough evidence to conclude that the true means are different at 5% of significance.

6 0

3 years ago

(4 + 8) / 2 x 2. Help pls!!!!!!!!!!!!!!!!

Shkiper50 [21]

Answer:

I think its 3 cus 4 +8 = 12 , 2 x 2 is 4 then 12 / 4 is 3

Step-by-step explanation:

8 0

3 years ago