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3 years ago

Is 31 and composite or prime

Mathematics

2 answers:

svp [43]3 years ago

7 0

Prime bc composite is when numbers can go into it

sergey [27]3 years ago

4 0

31 is a prime number.

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I have a two digit number the sum of the digits is 12 the first digit is 4 Less Than 3 times the second what is my number

nignag [31]

Answer:

Step-by-step explanation:

Let the first digit = x

Let the second digit =y

x + y = 12

x + 4 = 3*y

===========

From the second equation, we learn that x = 3y - 4

Put that into the first equation.

3y - 4 + y = 12 Combine the left side

4y - 4 = 12 Add 4 to both sides

4y = 16 Divide by 4

4y/4 = 16/4

y = 4

=================

x + 4 = 12

x + 4 - 4 = 12-4

x = 8

So the number is 84

3 0

3 years ago

I WILL GIVE BRAINLIEST!!! PLZ HELP ASAP!!

Verizon [17]

Answer:

A, the first one

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

Let f(x) be a polynomial function such that f(−4)=−5,f′(−4)=0 and f′′(−4)=1. classify the point (−4,−5).

svet-max [94.6K]

THis will be the coordinates of the point at a turning point on the graph.

Since the second derivative is positive (=1) it will be a minimum value of f(x).

3 0

4 years ago

You are going to a bowling alley and have $10 to spend. Renting bowling shoes cost $1.50. Each game cost $2.

MaRussiya [10]

Answer:

6.50

Step-by-step explanation:

10.00
$10.00 - 1.50 - 8.50 - 2.00 = 6.50$

7 0

3 years ago

What is the equation of the line that passes through the point (3, 0) and is perpendicular to the line 2x – y = 5?

Lisa [10]

Answer:

$\large\boxed{y=-\dfrac{1}{2}x+\dfrac{3}{2}}$

Step-by-step explanation:

$\text{Let}\ k:y=_1x+b_1\ \text{and}\ l:y=m_2x+b_2.\\\\l\ \perp\ k\iff m_1m_2=-1\to m_2=-\dfrac{1}{m_1}\\============================\\\\\text{We have}\ 2x-y=5.\\\\\text{Convert to the slope-intercept form y = mx + b:}\\\\2x-y=5\qquad\text{subtract 2x from both sides}\\\\-y=-2x+5\qquad\text{change the signs}\\\\y=2x-5\to m_1=2\\\\\text{Therefore}\ m_2=-\dfrac{1}{2}.$

$\text{The equation of the searched line:}\ y=-\dfrac{1}{2}x+b.\\\\\text{The line passes through }(3,\ 0).\\\\\text{Put the coordinates of the point to the equation.}\ x=3,\ y=0:\\\\0=-\dfrac{1}{2}(3)+b\\\\0=-\dfrac{3}{2}+b\qquad\text{add}\ \dfrac{3}{2} \text{to both sides}\\\\b=\dfrac{3}{2}$

8 0

4 years ago