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3 years ago

Which of the following questions could be used to represent the equation 4 · x = 28?

1 answer:

5 0

The answer is B, The product of 4 and what number is equal to 28. It is because, products are with multiplication. So it says "4 multiplied by a number (x) equals 28.

Answer:B

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3 years ago

Solve the equation using the Zero-Product Property. -5n(4n + 1) = 0

Irina18 [472]

Answer:

The final answers are n = 0 or n = -1/4.

Step-by-step explanation:

Given the equation is -5n(4n + 1) = 0.

The Zero-Product property says "if x*y=0, then x=0 or n=0 or both."

we have -5n(4n + 1) = 0.

We know -5 is not equal to 0.

It means n = 0 or 4n+1 = 0.

n = 0 or 4n = -1.

n = 0 or n = -1/4

So, final answers are n = 0 or n = -1/4.

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3 years ago

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Emily practices piano for 2/3 of an hour on Monday and 1/2 hour on Wednesdays. How many hours does Emily spend practicing piano

Sergeu [11.5K]

Answer:

50 minutes

Step-by-step explanation:

Given:

$\bullet \ \ \text{Monday:} \ \dfrac{2}{3} \times \text{Hour}\\\\\bullet \ \text{Wednesday:} \ \dfrac{1}{2} \times \text{Hour}$

Since Emily only practiced on Monday and Wednesday, the sum of time on both days is the time Emily practiced on the piano for a week.

$\implies \text{Monday + Wednesday = Total time practiced on piano for a week}$

Substitute the times in the equation

$\implies (\dfrac{2}{3} \times \text{Hour}) + (\dfrac{1}{2} \times \text{Hour}) = \text{Total time practiced on piano for a week}$

Simplify the equation

$\implies (\dfrac{2}{3} \times 60 \ \text{minutes}) + (\dfrac{1}{2} \times 60 \ \text{minutes}) = \text{Total time practiced on piano for a week}$

$\implies (20 \ \text{minutes}) + (30 \ \text{minutes}) = \text{Total time practiced on piano for a week}$

$\implies \boxed{50 \ \text{minutes} = \text{Total time practiced on piano for a week}}$

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2 years ago