All categories

3 years ago

I really need help so please help me I'm completely lost

Mathematics

2 answers:

o-na [289]3 years ago

4 0

SA = 1/2Pl+B

1/2 (72)(24) + 324

= 1188 in^2

son4ous [18]3 years ago

3 0

1,188 for surface area. If it's not about surface area I'm sorry bud

You might be interested in

3. The table shows the production results for three factories. How many cars are manufactured at the fastest factory in one year

Nata [24]

The answer to your question is C.16200

7 0

1 year ago

A toy previously sold for $10.00 now sells for 75 cents. Calculate the decrease in the value of the toy

kramer

The decrease in the value of the toy is $9.25 if you subtract $ 0.75 from $10.00 then you get $9.25 so it's $9.25 cheaper

7 0

2 years ago

Define a variable and write and inequality to model "To qualify for the long-jump finals, I need to jump at least 14 ft."

kvv77 [185]

2 is the anwser ok? LAright?

5 0

3 years ago

A new catalyst is being investigated for use in the production of a plastic chemical. Ten batches of the chemical are produced.

zzz [600]

Answer:

$CI=(66.54,78.46)$

Step-by-step explanation:

Given : A new catalyst is being investigated for use in the production of a plastic chemical. Ten batches of the chemical are produced. The mean yield of the 10 batches is 72.5% and the standard deviation is 5.8%. Assume the yields are independent and approximately normally distributed.

To find : A 99% confidence interval for the mean yield when the new catalyst is used ?

Solution :

Let X be the yield of the batches.

We have given, n=10 , $\bar{X}=72.5\%$ , s=5.8%

Since the size of the sample is small.

We will use the student's t statistic to construct a 995 confidence interval.

$\bar X\pm t_{n-1,\frac{\alpha}{2}}\frac{s}{\sqrt n}$

From the t-table with 9 degree of freedom for $\frac{\alpha}{2}=0.005$

$t_{n-1,\frac{\alpha}{2}}=t_{9,0.005}$

$t_{n-1,\frac{\alpha}{2}}=3.250$

The 99% confidence interval is given by,

$CI=72.5 \pm 3.25\frac{5.8}{\sqrt{10}}$

$CI=72.5 \pm 5.96$

$CI=(72.5+5.96),(72.5-5.96)$

$CI=(66.54,78.46)$

8 0

2 years ago

I am confused my teacher helped on the first problem but the rest didn't make sense any idea's?

Dovator [93]

2. The three points you need to mark on this graph are (1,2) (2,3) and (4,5); you then draw a line through all of these points and determine whether the inches of rainfall is proportionate to the number of hours.

You mark those 3 points because at 1 hour, 2 inches of rain has fallen; at 2 hours, 3 inches of rain has fallen; and at 4 hours, 5 inches of rain has fallen

7 0

3 years ago