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3 years ago

Which expression is equivalent? −7(4x − 3) A) 28x + 21 B) 28x − 21 C) −28x + 21 D) −28x − 21

2 answers:

7 0

Use the rule of distributive property.
a × (b + c) = (a × b) + (a × c)

-7(4x - 3)

-28x + 21

hope this helps, God bless!

Mumz [18]3 years ago

7 0

Answer:

The equivalent expression is C) -28x + 21

Step-by-step explanation:

Let's consider the following expression.

-7 × (4x - 3)

In order to find the equivalent expression, we can use the distributive property of multiplication over subtraction.

-7 × 4x - (-7) × 3

- 28x - (-21)

- 28x + 21

The equivalent expression is

C) -28x + 21

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I think it would be 9 meters.

Step-by-step explanation:

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28-10=18

18(divided by)2=9 meters

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Remark

You don't have to decompose the second one, and it is better if you don't. Just find the area as you probably did: use the formula for a trapezoid. You have to assume that the 6cm line hits the 2 bases at right angles for each of them, otherwise, you don't know the height. So I'm going to assume that we are in agreement about the second one.

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Answer:

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Step-by-step explanation:

We are given a joint probability table.

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2. Grade Tenth

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4. Grade Twelfth

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We want to find out the probability that the selected student is an eleventh grader given that the student is going on a field trip.

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Where P(FT) is the probability of students who will be going to field trip

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So the required probability is

$P( eleventh\: \: |\: \: FT)= \frac{P( eleventh\: \: and \: \: FT)}{P(FT)} \\\\P( eleventh\: \: |\: \: FT)= \frac{0.1413}{0.576} \\\\P( eleventh\: \: |\: \: FT)= 0.2453 \\\\P( eleventh\: \: |\: \: FT)= 24.53\% \\\\$

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