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kramer
3 years ago
13

Question

Mathematics
2 answers:
GalinKa [24]3 years ago
8 0

Answer:

3 hrs

Step-by-step explanation:

Thinking process:

Time taken by Sam = 4 hours

Time taken by Dave = 2 hours

Raking the lawn together will take them half the time each takes, so:

Sam = 0.5*4

       = 2 hrs

Dave = 0.5 * 2

         = 1 hr

Adding the hours gives = 2 + 1

                                        = 3 hrs

Alika [10]3 years ago
3 0

Answer:

1 hr 15 min

    or...

1.25 hrs

Step-by-step explanation:

Sam = 1/4 job = 1 hr

Dave = 1/2 job = 1 hr

1/4 +1/2 = 3/4

3/4 in one hour.

Thus they would take 1.25 hours to do the job together.

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lions [1.4K]
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3 years ago
According to Descartes's rule of sign, how many possible positive and negative roots are there for the equation
damaskus [11]
<h2>Descartes Rule of Sign</h2><h3>Answer:</h3>

There are 3 Real Roots for the Equation

<h3>Step-by-step explanation:</h3>

According to Descartes Rule of Sign, The maximum number of real roots a polynomial equation has is the number of times the sign of term changes from a higher power term to a lower power term.

In the given equation, 0=-4x^6-3x^5+2x^2-4x+1, we can already see that from \red -4x^6 to \red -3x^5 we can see that the sign didn't change so there might be no real roots. From \red -3x^5 to \blue +2x^2, we can see that the signs change so we now know that there might be 1 real root for equation. From \blue +2x^2 to \red -4x, the signs changed so there might be 2 real roots. From \red -4x to \blue +1, it changed again so there might be 3 real roots. There are no other term with lesser power to compare for \blue +1 so we are left with 3 real roots.

7 0
3 years ago
Read 2 more answers
Which expressions are equivalent?
KIM [24]

Answer:

first one

Step-by-step explanation:

Because the coefficient of x is 3 and coefficient of y is-7

3 0
3 years ago
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Need answer please help
PtichkaEL [24]

Answer:

-2/5

Step-by-step explanation:

3 0
3 years ago
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What is the quotient of 3/4 ÷ 5/12​
Marizza181 [45]

Answer:

1  4/5

Step-by-step explanation:

3/4 ÷ 5 /12

Copy dot flip

3/4 * 12/5

Rewriting

3/5 * 12/4

3/5 * 3

9/5

1 4/5

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3 years ago
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