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3 years ago

Simplify the expression below: 3(7x) -2(4-x)

Mathematics

2 answers:

Kryger [21]3 years ago

6 0

Answer:

The answer is

Step-by-step explanation:

First we must follow the order of operation: Please, Excuse, My, Dear, Aunt, Sally; Paranthesis, Exponents, Multiplication, Division, Addition, and Subtration.

First it says to look for parenthesis, which there are; so we do that first;.

3(7x) -2 (4 - x)

21x - 2 (4 - x)

21x - 2 times 4 (btw, we took x away because 4 - x)

^ (now we do multiplcation)

21x - 8

answer is 13 + 2x

Anna35 [415]3 years ago

4 0

the correct answer is C to this question

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4 years ago

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3 years ago

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3 years ago

Solve |x|>5 A. {-5,5} B. { x|-5 < x < 5 } C. { x|x < -5 or x > 5}

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3 years ago

A rectangle has an area of 2020cm².

Nadya [2.5K]

Answer:

Length = 2020 units

Width = 1 unit

Step-by-step explanation:

We know that area of a rectangle = length x width

We also know that perimeter = (2 x Length) + (2 x Width)

the goal is to to find Length and Width such that:

Condition 1: Length x width = 2020

Condition 2: (2 x Length) + (2 x Width)= maximum possible

We are also given that both Length and Width are whole numbers, hence we can start by finding the factors of 2020 into prime factors

Factor 2020: 2 x 2 x 5 x 101

By observation, we can see that the following combinations of the factors make up the required area of 2020:

Case 1: (1) x (2)(2)(5)(101) = 1 x 2020 = 2020

Perimeter = 2(1 + 2020) = 4042

Case 2: (2) x (2)(5)(101) = 2 x 1010 = 2020

Perimeter = 2(2+ 1010) = 2024

Case 3: (2)(2) x (5)(101) = 4 x 505 = 2020

Perimeter = 2(4 + 505) = 1018

Case 4: (2)(2)(5) x (101) = 20 x 101 = 2020

Perimeter = 2(20 + 101) = 242

Case 5: (5) x (2)(2)(101) = 5 x 404 = 2020

Perimeter = 2(5 + 404) = 818

Case 6: (2)(5) x (2)(101) = 10 x 202 = 2020

Perimeter = 2(10 + 202) = 424

From the above, it is clear that case 1 yields the largest perimeter

4 0

4 years ago