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AnnZ [28]
3 years ago
11

Help. When asked to factor the x^2 -100 a student gives the answer (x-10)(x-10) what is wrong with the answer

Mathematics
2 answers:
nlexa [21]3 years ago
5 0
It should be (x+10) (x-10) so the answer is c
aksik [14]3 years ago
4 0

Answer:

one of the minus signs should be a plus sign

Step-by-step explanation:

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The original rectangle has a perimeter of 16
svet-max [94.6K]

12.4 / 6.2 = 2

so other side of enlarged rectangle = 1.8 x 2 = 3.6

Perimeter of enlarged rectangle = 2(3.6 + 12.4) = 32

Answer: 32 feet

------------------------

Another way to do:

12.4 / 6.2 = 2

SF = 2

The original rectangle has a perimeter of 16

Perimeter of the enlarged rectangle = 16 x 2 = 32

Answer: 32 feet

5 0
4 years ago
Put the equation in standard form with a positive x coefficient y - 1 = 5/6 (x-4) ​
Anon25 [30]

Answer:

5x - 6y = 14

Step-by-step explanation:

The equation of a line in standard form is

Ax + By = C ( A is a positive integer and B, C are integers )

given

y - 1 = \frac{5}{6}(x - 4)

Multiply through by 6 to eliminate the fraction

6y - 6 = 5(x - 4) ← distribute

6y - 6 = 5x - 20 ( add 20 to both sides )

6y + 14 = 5x ( subtract 6y from both sides )

14 = 5x - 6y , thus

5x - 6y = 14 ← in standard form

3 0
3 years ago
A set of magnets cost $6.40. The store is offering a 10% discount on the magnets. Alicia Buys 2 sets of magnets with the discoun
Lorico [155]
One set of magnet with 10% discount would cost
(6.4)*(1-0.10) =
6.4*0.9 = 5.76
For two sets of magnets
5.76*2 =11.52
7 0
4 years ago
Read 2 more answers
a retiree invests $1240 for 3.5 years in a savings plan that pays a simple interest of 2.1% per year. How much interest will be
attashe74 [19]

Answer:



Step-by-step explanation:

I=Prt

I=1240*.021*3.5=91.14

4 0
3 years ago
Brandon purchased a new guitar in 2012. The value of his guitar, t years after he bought it, can be modeled by the function A(t)
Arte-miy333 [17]

Answer: The rate of change in the value of the guitar is modeled by 0.95, which represents a decrease of 5% per year.

Step-by-step explanation:

Hi, to answer this question we have to apply an exponential decay function:  

A = P (1 - r) t  

Where:  

p = original price

r = decrease rate (decimal form)  

t= years  

A = price after t years  

Replacing with the values given:  

A(t)=145(0.95)t.

Where

0.95 = 1-r

0.95-1 = r

-0.05 =-r

0.05 =r

Converting to percentage form:

0.05 x 100 = 5%

Feel free to ask for more if needed or if you did not understand something.  

6 0
4 years ago
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