Urgent help! Question: Write each of the following as an algebraic expression. a. In a supermarket, beef is sold at $17.50 a kg.

Question

Urgent help!
Question: Write each of the following as an algebraic expression.
a. In a supermarket, beef is sold at $17.50 a kg. write an equation for the cost of buying (x)kg of beef from this supermarket.

b. Write an expression for the number that results when you think of a number 3x, and 5 to it and take the square root of the result.

c. Write an expression for the perimeter of a rectangle whose length is 4cm more than it’s width which is (x)cm.​

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Ruby 2 weeks 2021-10-05T01:52:07+00:00 1 Answer 0

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    2021-10-05T01:53:54+00:00

    Answer:

    a. y = 17.5x

    b.  \sqrt{3x + 5}

    c. 4x + 8

    Step-by-step explanation:

    a.

    Beef costs $17.50 per kg. That is a unit rate. To find the price of an amount x of beef, multiply the amount, x, by the unit rate.

    y = 17.5x

    b.

    I think you may mean “add,” not “and.”

    “Write an expression for the number that results when you think of a number 3x, add 5 to it and take the square root of the result.”

    The number is 3x.

    Add 5 to it to get 3x + 5.

    Take the square root to get

     \sqrt{3x + 5}

    c.

    The width is x. The length is 4 cm more than x, so it is x + 4.

    Length: x + 4

    Width: x

    perimeter = length + length + width + width

    P = 2L + 2W

    P = 2(L + W)

    P = 2(x + 4 + x)

    P = 2(2x + 4)

    P = 4x + 8

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45:7+7-4:2-5:5*4+35:2 =? ( )