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4 years ago

Which expression would be easier to simplify if you used the commutative property to change the order of the numbers?

Mathematics

1 answer:

Cerrena [4.2K]4 years ago

3 0

Answer: A. 30+(-12)+70

Step-by-step explanation:

Commutative property of addition is given by : a+b = b+a , where a and b can be any expression of real numbers.

It basically changes the order of the so that simplification of any expression becomes easier.

In A. we use this property as

30+(-12)+70 = 30+[(-12)+70]

= 30 + [70+(-12)] [we switched order of (-12) and 17]

= 30+70-12

= 100-12

= 88

The rest of the expression already arranged accordingly, there is no need to apply commutative property to change the order of the numbers.

So the correct option is A. 30+(-12)+70.

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Which of these transformations are isometries?

yulyashka [42]

Answer:
I, II and III.

Explanation:
An isometry is a transformation that preserves the size of the pre-image in the image and the corresponding angles and sides are also congruent.

In each one of the images, the figure given is he same size as the pre-image and The corresponding angles and corresponding sides are congruent; therefore they are all isometries.

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3 years ago

Where are all my math nerds and experts at? Help me out!

sashaice [31]

Solution:

The interior angles of a triangle sum up to 180°

This means that...

3(x + 2) + 52 + 35 = 180

Simplify the distributive property.

3x + 6 + 52 + 35 = 180

Combine like terms.

3x + (6 + 52 + 35) = 180
=> 3x + (93) = 180

Subtract 93 both sides.

3x + (93) = 180
=> 3x + 93 - 93 = 180 - 93

Simplify both sides.

=> 3x = 87

Divide 3 both sides.

=> 3x/3 = 87/3
=> x = 87/3 = 29

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2 years ago

The claim is that the white blood cell counts of adult females are normally distributed, with a standard deviation equal to 1.6

loris [4]

The population standard deviation, σ = 1.68, the sample standard deviation, s = 1.95, the sample mean =7.23, and the sample size, n = 39.The test statistics is given by
T=(n - 1) (s / σ)²
= (39 - 1) (1.95 / 1.68)²
= 38 (1.35)= 51.196

3 0

3 years ago

Triangle ABC is a right triangle.

mina [271]

Answer:

They are complementary.

Step-by-step explanation:

we know that

The sum of the interior angles of a triangle must be equal to 180 degrees

A+B+C=180°

where

A,B and C are the measures of the interior angles of triangle

In a right triangle

The measure of angle C ( I assume that the right angle is C) is equal to 90 degrees

A+B+90°=180°

A+B=180°-90°

A+B=90°

Remember that

If two angles are complementary, then their sum is equal to 90 degrees

therefore

A and B are complementary angles

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4 years ago

Read 2 more answers

A method to prove statements using properties that justify each step.

vesna_86 [32]

Answer:

A two column proof is a method to prove statements using properties that justify each step. The properties are called reasons.

Step-by-step explanation:

hope dis helps!

6 0

3 years ago