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4 years ago

Give a reason to justify the equation. 3 • (10 • 12) = (3 • 10) • 12

Mathematics

1 answer:

ankoles [38]4 years ago

4 0

Answer:

According to commutative property of multiplication, changing the order of operants does not change the result. In that sense, no the numbers we multiply first, the result will be the same.

To prove this:

3 • (10 • 12) = 3 • (120) = 360

On the other hand:

(3 • 10) • 12 = (30) • 12 = 360

The result is exactly the same!

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True or False: (EXPLAIN your answer) If angle CEF is complementary to angle DCF,

frosja888 [35]

Answer:

True

Step-by-step explanation:

Givens:

From if part: m<CEF+m<DCF=90

From picture: m<CEF+m<FEG=90

Subtracting the equations we get:

m<DCF-m<FEG=0

Adding m<FEG on both sides:

m<DCF=m<FEG

So true.

6 0

3 years ago

F the experimental value for the percentage of o is 37%, the accepted value of the percentage of oxygen is 40%, what is the perc

fenix001 [56]

The percentage error can be calculated using the following rule:
% error = difference between values / accepted value

From the givens:
The accepted value = 40%
Difference between values = 40% - 37% = 3%

Substitute in the equation to get the percentage error as follows:
% error = (3/40) * 100 = 7.5%

3 0

3 years ago

Read 2 more answers

My son hasn't knows how to do that can somebody help him please .

kobusy [5.1K]

A ratio compares two quantities.

How may days are in May? <span>31
How many days in a year? </span>365

Now, we are being asked to compare may to a year.

Answer: 31 to 365

Now, the other is easy also.

A triangle has 3 sides, and a square has 4.

Answer: 3 to 4

Find equal ratio's

8/12 = 2/3 = 4/6 = 16/24

20/25 = 4/5 = 40/50 = 80/100

Done! Enjoy! :) I hope I helped your son. Take care.

3 0

3 years ago

Solve the system using the substitution method. y = -5x – 13 6x + 6y = -6 please help me NO LINKS!

lana [24]

Answer:

Step-by-step explanation:

y=-5x-13

Since we know the value of y we can substitute it in

6x+6(-5x-13)=-6

6x-30x-78=-6

-24x=72

-x=3

x=-3

Now that we know the value of x we can solve Y

y=-5(-3)-13

y=15-13

y=2

3 0

3 years ago

In the past, professional baseball was played at the Astrodome in Houston, Texas. The Astrodome has a maximum height of 63.4 m.

8_murik_8 [283]

Answer:

The correct value of the h function is; h= -9.8t² + 45t + 1

Using the discriminant, no real solution exists and the baseball will not hit the roof

.Step-by-step explanation:

h= -9.8t² + 45t + 1

Astrodome has a maximum height of 63.4 m

find out if the baseball hit at a velocity of 45 m/s will hit the roof, we'll replace h with 63.4m.

Thus;

63.4 = -9.8t² + 45t + 1

Subtract 63.4 from both sides to give;

-9.8t² + 45t + 1 - 63.4 = 0

-9.8t² + 45t - 62.4 = 0

Using quadratic formula, we have;

t = -45 ± √{(45² - (4 * (-9.8) * (-62.4)}

t = -45 ± √(2025 - 2446.08)

t = -45 ± √(-421.08)

The discriminant is -421.08

This value is less than 0.

Thus, no real solution exists and the baseball will not hit the roof.

8 0

3 years ago