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iren2701 [21]
3 years ago
6

I will give brainliest!

Mathematics
1 answer:
Nookie1986 [14]3 years ago
5 0
Area of flower bed = 1/2 * 10 * 25 = 125 sq ft

Area outside flower bed = 20*35 - 125  = 575 sq ft

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Simplify the following expression.<br> ?<br> 9t2 + 7t + 4 - 2t2 + 5t
Katen [24]

Answer:

I'm assuming the 2 after 9t and -2t means squared.

7t² + 12t + 4

Step-by-step explanation:

To simplify the expression we should combine like terms. Like terms are terms with same variables and powers.

Let's start with 9t² and -2t² since they have the same variable and power of t². To combine them we should add them together which would be: 9t² + (-2t²) = 9t² - 2t² = 7t²

Next we can combine 7t and 5t since they have the same variable and power of t. 7t + 5t = 12t

4 doesn't have any like terms so we leave it as it is.

Lastly we add all of our terms: 7t² + 12t + 4

6 0
3 years ago
To estimate the mean of a population with unknown distribution shape and unknown standard deviation, we take a random sample of
Naddika [18.5K]

Answer:

t_{critical} = \pm 1.7793                        

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 64

Sample mean = 22.3

Sample standard deviation = 8.8

We want to estimate 92% confidence interval.

92% Confidence interval:  

\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}  

Putting the values, we get,

Degree of freedom = n - 1 = 63

t_{critical}\text{ at degree of freedom 63 and}~\alpha_{0.01} = \pm 1.7793  

22.3 \pm 1.7793(\dfrac{8.8}{\sqrt{64}} ) = 22.3 \pm 1.95723 = (20.34,24.26)

7 0
4 years ago
What multiplication fact could you use to find a number that can be divided evenly by 8 and by 9
Ad libitum [116K]
72 would be a good one
8 0
4 years ago
Read 2 more answers
As a part of your project studying tipping behavior, you ask people the question, How much should you tip a grocery bagger for c
Darina [25.2K]
Don’t have idea for this work can of confused
6 0
3 years ago
Read 2 more answers
A car completes a journey at an average speed of 40km/h.At what speed must it travel on the return journey if the average speed
nalin [4]
The distance, s = 40t₁ where t₁ is the time to complete the outward journey.
The same distance = vt₂ where t₂ is the time to complete the return journey at speed v.
For the whole journey, 2s=60(t₁+t₂). Therefore s=30(t₁+t₂)=40t₁=vt₂.
30t₁+30t₂=40t₁, 10t₁=30t₂, t₁=3t₂, so s=120t₂=vt₂ and v=120kph.
5 0
3 years ago
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