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jeyben [28]
3 years ago
10

I need to know how to solve these problems because i do nkt understand them

Mathematics
1 answer:
Elza [17]3 years ago
4 0
So, for this kind of problem you need to FOIL. 
This stands for:
F- first
O-outer
I-inner
L-last

What this means is that:
step 1- multiply the FIRST terms in each thing. So for example in problem 6 of the problems you sent it would be x times x.  = x^{2}
step 2- multiply the OUTER terms in each thing. So for example in problem 6, it would be x times 3.  =3x
step 3- multiply the INNER terms in each thing. So for example in problem 6, it would be 6 times x.  =6x
step 4- multiply the LAST terms in each thing. So for example in problem 6, it would be 6 times 3.  =18
step 5: you add all of your products. So for problem 6 it would be y= x^{2} + 9x +18.
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An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in California. Suppose that
sergiy2304 [10]

Answer:

(22.0297, 23.3703)

Step-by-step explanation:

Given that an economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in California.

Let X be per capita income (in thousands of dollars) for a major city in California.

Mean = 22.7

n = 183

Population std dev = 6.3

Since population std dev is known we can use Z critical value.

Std error = \frac{6.3}{\sqrt{183} } \\=0.4657

Z critical =1.44

Marginof error = ±1.44*0.4657=0.6706

Confidence interval 85%

=(22.7-0.6703, 22.7+0.6703)\\= (22.0297, 23.3703)

7 0
3 years ago
Factor the trinomial<br><br> X2-12x +16
wlad13 [49]
2*&/45/+=67364/3/4/32:5,6544 is hothead answer
6 0
3 years ago
Jane is having difficulty deciding whether to put her savings in the Mystic Bank or in the Four Rivers Bank. Mystic offers a 12%
Ad libitum [116K]
The answer to this question would be <span>B. Mystic
</span><span>

Since the rate should be constant, option C and D wouldn't be true.</span>
If the Four Rivers bank gives 12% per year and Mystic Bank gives 14% per year, it will be 3% per quarter year for Four Rivers Bank and 7% semiannually for Mystic Bank. 
The total rate would become:
Four rivers 103%^4= 1.125
Mystic : 107%^2= 1.145

5 0
3 years ago
In triangle PQR point c is the centroid if PQ= 30 then PX=
vova2212 [387]

Answer:

15

Step-by-step explanation:

since c is the centroid, therefore PX=XQ=1/2 x PQ

∴ PX=15

3 0
3 years ago
What is the probability that it is not blue?
Alisiya [41]
1/3 chances the bubblegum is blue. To solve this problem you add all of the bubblegum together so 25+20+15 to get 60 then express it as a fraction to show only the blue pieces which would be 20/60 and you can simplify it to 1/3 or 33.33%
8 0
3 years ago
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