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Dima020 [189]
4 years ago
5

Can someone please help me because i really need help with this

Mathematics
1 answer:
jasenka [17]4 years ago
6 0

Answer: Listen man i would help you but i cant this is a test i saw this before

Step-by-step explanation:

You might be interested in
A research study was performed to determine if more than 30% of first-grade students at one school have entered Piaget’s concret
suter [353]

Answer:

Type I error

Step-by-step explanation:

A type I error occurs if the null hypothesis is rejected when it is actually true.

Type I                                      Type II

Reject null when true           Fail to reject null when not true

Null hypothesis: ∪ = 30%

Alternative hypothesis: ∪ > 30%

The researchers concluded that more than 30% of first-grade students at this school have entered the concrete operational stage of development and they rejected the null hypothesis.

However, a census actually found that in the population of all first graders at this school, only 28% have entered the concrete operational stage.

A type I error has been made because in actuality the null hypothesis was true but was rejected.

7 0
3 years ago
if there are 2040 seats in a section of a stadium, 20 seats in the first row, and 4 more seats in each row, how many rows are th
Lorico [155]


2040 = n/2(20+(n-1)4)

4080 = n(20+4n-4)

4080= 20n +4n^2 -4n

1020 = 4n + n^2

n^2 +4n -1020 =0

use common formula (can't write out so just look at answers. sorry)

which gives answers of n=-34 and n=30. since n can only be positive, n=30 so there are 30 rows. I liked that challenge

5 0
3 years ago
Read 2 more answers
I’ve tried so many things but I can’t find the Answer
Virty [35]

Answer:

let \: that \: be \:  \: x \\ 20\% \: of \: x \: is \: 6 \\  \frac{20}{100}  \times x = 6 \\ 20x = 600 \\ x = 30

3 0
3 years ago
Read 2 more answers
Please help for solve this question
Schach [20]
You set up the problem correctly, just keep going.

Expand out your expression:

2x(3x-9) + 4x(x+13)
= 6x^2 -18x + 4x^2 + 52x 
= 10x^2 +34x

Remember that the above expression is the area, so it is equal to 24.

10x^2 + 34x = 24
10x^2 + 34x - 24 = 0     (divide by 2)
5x^2 + 17x - 12 = 0

Done.
5 0
4 years ago
What is the period of the graph of y= 1/2 sin (pi x)+3
ddd [48]

Answer:

isdshdlsjfhld.as

Step-by-step explanation:

:)

8 0
3 years ago
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