Which of the following can not be used on a matrix when solving a system of equations

terry opened a savings account in December with $132 and saved $27 each month beginning in January the value of terrys account i

liq [111]

Let S be the amount in a savings account.
Let m be the number of months.

General equation
S = 132 + 27m

Specific question
July is the 7th month of the year including both January and July.
S = 132 + 7*27
S = 132 + 189
S = 321

Reasonableness?
Good question. You could estimate an answer.
Start with 150 dollars and say that you add 25 a month.
7 * 25 = 175
S = 150 + 175 = 325 All of this was done in my head. Since the exact answer obtained using the formula is 321, I think that's pretty reasonable using my estimate is a guide.

4 0

3 years ago

If x2 + y2=6 , xy = 5 , then (X + y)2? <br><br><br><br>

VARVARA [1.3K]

Answer:

(x + y)² =16

Step-by-step explanation:

hello :

(x + y)² = x²+y²+2xy and : x²+y² = 6 xy = 5

(x + y)² = 6+2(5)

(x + y)² =16

3 0

3 years ago

ted science class collects aluminum cans to sell to the recycling center. the center pays $0.002 for each kilogram of aluminum

pshichka [43]

Since there is no way to determine what is asked from the given above, I assumed that it is the total earning from the sales of the aluminum cans. To answer, multiply the mass of aluminum cans in kilograms to the price of 1 kilogram of cans. Example, if there are x kilograms of aluminum cans, the total earning would be $0.002x.

7 0

3 years ago

Data for a particular subdivision near downtown Houston indicate that the average price per square foot for a home is $100 with

spayn [35]

Answer:

$P(X>110)=P(\frac{X-\mu}{\sigma}>\frac{110-\mu}{\sigma})=P(Z>\frac{110-100}{5})=P(z>2)$

And we can find this probability with the complement rule and we got:

$P(Z>2) = 1-P(Z$

And using the normal standard table or excel we got:

$P(Z>2) = 1-P(Z$

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Solution to the problem

Let X the random variable that represent the prices of a population, and for this case we know the distribution for X is given by:

$X \sim N(100,5)$