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1 year ago

My sis needs help asap

Mathematics

2 answers:

steposvetlana [31]1 year ago

7 0

Answer:

c. $750

Step-by-step explanation:

the perimeter is 80m

80÷8=10

10*75=750

nignag [31]1 year ago

4 0

Answer:The answer is b

Step-by-step explanation:

hope this helps.

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Who can help and explain these 2 questions

Dominik [7]

Coefficients are added together because they are like terms, this can be proven with the distributive property. For example, x(2x+x)=2x^2+x^2=3x^2.

The commutative property of addition and the associative property demonstrate this.

The word "commutative" comes from "commute" or "move around", so the Commutative Property<span> is the one that refers to moving values around.
</span>
The associative property<span> states that you can add or multiply regardless of how the numbers are grouped. </span>

6 0

3 years ago

I need help with exercises 3,4, and 6 please show all work and don’t answer number 5 just tell me if it is correct

joja [24]

*If you need me to do #5, DM me!

3. The area of a triangle can be given by (just plug and chug as always):
$A_t = \frac{1}{2} bh = \frac{1}{2}(3)(4) = 6ft^2$
The area of the triangle is 6ft².

4. I will divide into a triangle and a rectangle (because the actual equation for the area of a pentagon requires it to be a perfect pentagon). Let's do the triangle first (height is 3 because you subtract 12 from 15):
$A_t = \frac{1}{2} bh = \frac{1}{2}(8)(3) = 12m^2$
$A_r = bh = 12(8) = 96m^2$
Now we just add them:
$96+12 = 108m^2$

So, the area of that pentagon is 108m².

5. You are actually wrong on this one because the area of a triangle is:
$A_t = \frac{1}{2}bh$
So, just halve your answer and it will be correct.

6. We can just split it into 4 triangles of equal area and then multiply the area of 1 triangle by 4 to get the total area. Let's do just that:
$A_t = \frac{1}{2}bh = \frac{1}{2}(2.5)(5) = 6.25cm^2$
Multiply by 4 to get total area:
$6.25*4 = 25cm^2$

So, the area of the given rhombus is 25cm².

8 0

3 years ago

Find the cardinal number for the given set.

iris [78.8K]

Answer:

The cardinal number is 12

Step-by-step explanation:

The cardinal number of a set represents the number of distinct elements of the set. That means for this exercise the goal is to identify the total number of elements of the set.

First step. Identifying the elements of the set.

If we look at the sequence 9, 11, 13, ... , 31, we have an arithmetic sequence $a_n$ , so we can start by finding the common difference d.

$d = a_{n+1}-a_n$

That means we can pick any 2 consecutive terms and find the subtraction of them, so we can pick for example 9 and 11, thus we get

$d= 11-9\\d=2$

Second step. Finding the number of terms of the arithmetic sequence.

Now to find the number of elements n of that sequence, we can look at the last number of the sequence on this case it is 31, and we can use the formula for the nth term, that is

$a_n=a_1 + d(n-1)$

Replacing the last term $a_n = 31$ and the initial term $a_1=9$ , will give us

$31=9+2(n-1)$

From there we can solve for n, by moving first that 9 to the other side.

$31-9=2(n-1)\\22=2(n-1)$

Then we can divide both sides by 2, and lastly add by 1.

$\cfrac{22}{2} = n-1 \\11 = n-1\\\boxed{n= 12}$

Thus since the sequence has 12 elements, we know that the cardinal number of the set is 12.

7 0

2 years ago

A news station would like to conduct an exit poll to determine the likelihood that a highly debated amendment will receive enoug

vladimir1956 [14]

Answer:

The expression is $n = (\frac{1.645*0.5}{0.03})^2$

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.