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2 years ago

Leticia simplified an expression. Her work is shown below.

Mathematics

1 answer:

victus00 [196]2 years ago

4 0

Leticia made a mistake in her step 2. She did subtraction before multiplication.

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<h3>How to simplify an expression?</h3>

The expression can be simplified as follows;

4.5 ÷ 0.25 + 2.5 - 0.75 × 8

Hence, using Pemdas rule,

4.5 ÷ 0.25 + 2.5 - 0.75 × 8

18 + 2.5 - 0.75 × 8

18 + 2.5 - 6 = 14.5

Therefore, she made mistake in her step 2 because she was suppose to solve the multiplication before subtraction.

learn more on expression here: brainly.com/question/13545210

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You have made it to the final round of a game show. The announcer asks you the final multiple choicequestion, which has four pos

Fynjy0 [20]

Answer:

The best option is to phone a friend which will yield a total earnings of $ 806,400

Step-by-step explanation:

From the analysis of the question, there is the probability of success and failure.

if he choose not to answer which is the probability of success, his earnings = $500,000.

if he he answers the question correctly, his earnings = $1,000,000 which in the end, is still a success for him

if he answers the question wrongly, his earnings = $32,000

the last option is to phone a friend and he will either choose option a or option b

Probability of choosing option A = 0.6

Probability of choosing option B = 0.4

<h3>For the second option ( option a) ; If he chooses to answer the question by going with option a</h3>

expected earnings = P(choosing A) x his earnings if correct + P(choosing B) x his earnings if wrong

= 0.6 x 1,000,000 + 0.4 x 32,000

= $612,000 will be his earning by second option

if he picks the option b = P (choosing B) x his earnings if correct + P(choosing A) x earnings if wrong = 0.4 x 1,000,000 + 0.6 x 32,000

= $419,000

<h3>if he chooses the third option of phoning his friend; since his probability of either a or b is like 80% (o.8) if correct and 0.2 (20%) if wrong = </h3>

from the P(success) + P( failure) =1

His earnings = Probability of success x earnings if correct + Probability of failure x earnings if incorrect = 0.8 x 1,000,000 + 0.2 x 32,000

= $806,400

from the calculation done, it is apparent that his best option is to go by phoning a friend since that will yield more earnings for him which is greater than his earnings by going for the second options hence the best option is phoning a friend as this will accrue his expected earning to be $ 806,400

5 0

4 years ago

What is the solution to 5/8 - 1/4

Natalka [10]

5/8 - 2/8, because you need common denominators, therefor the answer is -3/8

3 0

3 years ago

Read 2 more answers

First I will build the envelope. For this, I am using a rectangular piece of material 28m long and 12m wide. Out of this materia

RUDIKE [14]

Answer:

3.728 cm²

Step-by-step explanation:

To built the envelope I am using a rectangular piece of material 28 m long and 12 m wide.

Out of this material, I have to cut patches that are 1/12 the length and 2/15 the width of the whole material.

So, the length of the patches is $28 \times \frac{1}{12} = 2.33$ m and the width of the patches is $12 \times \frac{2}{15} = 1.6$ m.

Therefore, the area of the patches is (1.6 × 2.33) = 3.728 m² each. (Answer)

Now, the area of the rectangular piece of material is (28 × 12) = 336 m²

Hence, $\frac{336}{3.728} = 90.37$ ≈ 90 such patches can be made out of the whole material. (Answer)

3 0

3 years ago

Evaluate the expression:<br> -(-49)<br><br> -48<br> -49<br> 49<br> 50

Aliun [14]

49, here's why...

a negative multiplied by a negative equals a positive, and if you're working with parentheses, and you don't see a sign, at all, then it means you have to multiply.

hope I helped :)

5 0

4 years ago

a bicycle wheel has a diameter of 65cm what is the length of 1000 revolutions of the wheel in metres

In-s [12.5K]

Answer: 2041 meters

A bicycle wheel is a circular object.

The circumference of a circle is 2π(radius)

Here given:

diameter: 65 cm

radius = diameter/2 = 65/2 = 32.5 cm

Hence find the length for each revolution:

2π(32.5) = 204.1 cm per revolution

Then for 1000 revolutions:

204.1 × 1000 = 204100 cm ≈ 2041 meter

7 0

2 years ago