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3 years ago

Is 21 prime or composite

Mathematics

2 answers:

Evgen [1.6K]3 years ago

7 0

Answer: composite

Step-by-step explanation: :)

Rudiy273 years ago

3 0

Answer:

Im pretty sure 21 is composite

Step-by-step explanation:

Hope this helps and sorry if its incorrect

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Two brothers, richard and andrew, share a sum £30 in the ratio 3:7. how much does each brother get?

Elina [12.6K]

Answer:

£9,£21

Step-by-step explanation:

richard:andrew=3:7

3+7=10

£30÷10=£3

richard=3×£3=£9

andrew=7×£3=£21

5 0

3 years ago

Read 2 more answers

7 1/6 = 5 2/5 + p<br><br> p = ???

Crank

$\huge\textbf{Hey there!}$

$\mathbf{7\dfrac{1}{6} = 5\dfrac{2}{5} + p}$

$\rightarrow\mathbf{7 \dfrac{1}{6} = 5\dfrac{2}{5} + p}$

$\mathbf{\rightarrow p + 5\dfrac{2}{5}= 7\dfrac{1}{6}}$

$\mathbf{\rightarrow {p + \dfrac{27}{5}=\dfrac{43}{6}}}$

$\text{SUBTRACT }\rm{\dfrac{27}{5}}\text{ to BOTH SIDES}$

$\mathbf{p + \dfrac{27}{5} - \dfrac{27}{5} = \dfrac{43}{6}- \dfrac{27}{5}}$

$\text{CANCEL out: }\rm{\dfrac{27}{5} - \dfrac{27}{5}}\text{ because it gives you 0}$

$\text{KEEP: }\rm{\dfrac{43}{6} - \dfrac{27}{5}}\text{ because it help solve for the p-value}$

$\text{NEW EQUATION: }\rm{p = \dfrac{43}{6} - \dfrac{27}{5}}$

$\large\textsf{SIMPLIFY IT!}$

$\mathbf{p = \dfrac{53}{30} \approx p = 1\dfrac{23}{30}}$

$\huge\boxed{\textsf{Therefore, your answer is: \boxed{\mathsf{p = 1\dfrac{23}{30}}}}}\huge\checkmark$

$\huge\textbf{Good luck on your assignment \&}\\\huge\textbf{enjoy your day!}$

~ $\frak{Amphitrite1040:)}$

3 0

2 years ago

Read 2 more answers

Suppose that nine-digit Social security numbers are assigned at random. If you randomly select a number, what is the probability

Rina8888 [55]

Answer: 0.3 .

Step-by-step explanation:

The digits in number system = 10 ( 0 to 9)

The total different nine-digit Social security numbers = $10^9$ [By Fundamental counting principle]

$=1,000,000,000$ = 1 billion

Total people in united state = 300 million = 300, 000 ,000

Since each person In US have equal chance to get chosen.

Therefore , if a number is selected randomly , then the probability that it belongs to one of the 300 million people in the United States :-

$=\dfrac{300, 000 ,000}{1,000, 000 ,000}=0.3$

Hence, the required probability is 0.3 .

6 0

4 years ago

marge cut 16 pieces of tape for mounting pictures on poster board. each piece of tape was 3/8 inch long. how much tape did marge

Tomtit [17]

Answer:

Total tape used by marge is 6 inches .

Step-by-step explanation:

As given

marge cut 16 pieces of tape for mounting pictures on poster board.

$Each\ piece\ of\ tape\ was\ \frac{3}{8}\ inch\ long.$

Total tape marge uses = Number of pieces × Each piece length

$Total\ tape\ marge\ uses = \frac{16\times 3}{8}$

Total tape marge uses = 2 × 3

= 6 inches

Therefore the total tape used by marge is 6 inches .

8 0

3 years ago

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The sum of 2 numbers is 20 and their product is 90. What are the two numbers? (Note: Write the smaller number first.)

DIA [1.3K]

The two numbers are 8 and 12.

When added, you get a sum of 20.

When multiplied, you get a product of 96.

4 0

3 years ago