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nalin [4]
3 years ago
12

Solve by Factoring: n2 - 100 = 0

Mathematics
1 answer:
algol133 years ago
7 0

Answer: (n+10)(n-10)=0

Step-by-step explanation:

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The school wishes to purchase 2500 pens and have discovered that 3 stores sell the same model pen.Which store has the best buy ?
8_murik_8 [283]
Store\ A:  \frac{0.5}{15}=0.0333\ cents\ per\ pen \\  \\ Store\ B: \frac{1.7}{50}=0.034\ cents\ per\ pen \\  \\ Store\ C: \frac{0.9}{30} =0.03\ cents\ per\ pen \\  \\ Store\ C\ is\ the\ cheapest.
7 0
3 years ago
4) 3 + 2x - 8x = -15
Bond [772]

Answer:

=3

Step-by-step explanation:

Combine like terms 3-6x=-15

Subtract 3 from both sides of the equation -6x=-18

divide both sides by 6  x=3

8 0
2 years ago
The circumference of a circle is 22 cm.
valkas [14]

\bf \: Circumference \:  of  \: a \:  circle = 2\pi \: r

\implies22 = 2 \times  \dfrac{22}{7}  r

\implies22 =  \dfrac{44}{7}  \times r

\implies \: r =  \dfrac{22 \times 7}{44}

\implies \boxed{ r =  \dfrac{7}{2} }

Now,

\bf \: Area \:  of  \: circle = \pi {r}^{2}

\rightarrow \:  \frac{22}{7}   \times  ({ \frac{7}{2}) }^{2}

\rightarrow \frac{22}{ \cancel7}  \times  \frac{ \cancel{49}}{4}

\rightarrow \: 22 \times  \frac{7}{4}

\rightarrow \: 11 \times  \frac{7}{2}

\rightarrow \frac{77}{2}

\rightarrow \: 38.5 \: cm {}^{2}

Area of rectangle = 38.5 cm².

7 0
3 years ago
Solve for x the rest of the question is in the png
zvonat [6]

Answer:

33.18

Step-by-step explanation:

Use law of sines.

x / sin(65°) = 21 / sin(35°)

x = 21 sin(65°) / sin(35°)

x ≈ 33.18

3 0
3 years ago
The Ragnier's purchased a house for $357,000. They sold their home for $475,000. What was the percent increase?
ehidna [41]

Answer:A

Step-by-step explanation:trust me brother

7 0
3 years ago
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