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2 years ago

The rule that refers to grouping is blank property

Mathematics

2 answers:

baherus [9]2 years ago

5 0

Answer:

associative property

Step-by-step explanation:

Grouping like this

a + (b + c) = (a + b) + c

a(bc) = (ab)c

is the associative property

Degger [83]2 years ago

5 0

Answer= Associative Property

Step-by-step explanation:

Affiliate. The word "associative" comes from "associate" or "group"; the Associative Property is the rule that refers to grouping. For addition, the rule is "a + (b + c) = (a + b) + c"; in numbers, this means 2 + (3 + 4) = (2 + 3) + 4.

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The smallest angle of rotational symmetry for a regular polygon is 30°. How many sides does the regular polygon have?

lyudmila [28]

Answer:

Number of sides are 12.

Step-by-step explanation:

Given that smallest angle of rotational symmetry for a regular polygon is 30°.

we have to find the number of sides does the regular polygon have.

If we can rotate a figure around a center point by fewer than 360° and the figure appears unchanged, then the figure has the rotation symmetry.

Now as at the centre the angle is 360 and all the angles at the centre formed equal i.e

$\text{No. of sides= }\frac{360}{\text{smallest angle at centre}}=12$

Hence, 12 number of sides the polygon have.

5 0

4 years ago

Read 2 more answers

Pls help and remember to include the paranthesis

nydimaria [60]

I did this to get 47.5 as the answer not 47 im not sure why but i did (61-7+7×1/2)+17 using the PEMDAS please excuse my dear aunt sally
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3 years ago

Find the probability that his/her household has four or more cell phones in use. Is it unlikely for a household to have four or

sineoko [7]

Answer:

Event not unlikely

Step-by-step explanation:

Probability is defined as the likelihood of an event occurring.

$P(E)=Event/Total \ outcomes$

Total outcome, $T_o$ =Total responses record which is:

$T_o=218+296+362+148+142=1166$

$P_e=142$

Therefore the probability of 4+ phones is

$P(x\geq 4)=142/1166=0.1218$

Since $0.1218>0.05$ , the event is not unlikely

5 0

4 years ago

Solve the system by substitution.<br> 2.5x-3y=-13<br> 3.25x-y=-14

MrMuchimi

Answer:

x=-4

y=1

Step-by-step explanation:

For the given system of equations,

2.5x-3y=-13.....eqn(1)

3.25x-y=-14.....eqn(2)

We first make y the subject of eqn (2)

This implies that,

y=3.25x+14.....eqn(3)

We substitute eqn (3) into eqn (1)

2.5x-3(3.25x+14)=-13

2.5x-9.75x-42=-13

-42+13=9.75x-2.5x

-29=7.25x

Dividing through by 7.25, we obtain

x=-4

We now put the value of x into eqn (2)

3.25(-4)-y=-14

This implies that,

-13+14=y

y=1

4 0

3 years ago

Balance the following : <br>K + H20----------> KOH +H2<br>please help fast I'm giving an exam

Elza [17]

Step-by-step explanation:

2K + 2H2O ➡ 2KOH + H2

Hope it helps :)

7 0

3 years ago