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4 years ago

13

Kelly bought a pair of sneakers for $ 35.00. She also bought a pile of different laces. Each set of laces, L, costs $ 3.00. Writ

e a variable expression to show how Kelly could calculate her total cost

1 answer:

Anika [276]4 years ago

8 0

Answer:

Well Kelly should do L($3.00)+$35.00

The final answer depends upon how many packages of laces she buys.

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Perform the following multiplication<br><br>a) 9xy ( x²y – xy²)<br><br>b) 7 p²q² (9 pq - 9 p²q²)

erastova [34]

Answer:

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3 years ago

$149 guitar; 29% discount

Vikki [24]

Divide number of guitars by 100% and multiply into discount given

149/100 x 29

1.49 x 29

43.21

$43.21 had been removed

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4 years ago

5x-3y when x=7 and y=-8

I am Lyosha [343]

5 (7) - 3 (-8)

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Because two negatives equal a positive the subtraction sign will change into an addition sign.

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3 years ago

Change the subject of the formula L = v 4kt - p to k.

Romashka [77]

Answer:

$\boxed{k = \frac{L^2 + p}{4t}}$

General Formulas and Concepts:

<u>Algebra I</u>

Basic Equality Properties

Multiplication Property of Equality
Division Property of Equality
Addition Property of Equality
Subtraction Property of Equality

Step-by-step explanation:

<u>Step 1: Define</u>

<em>Identify given.</em>

<em /> $\displaystyle L = \sqrt{4kt - p}$

<u>Step 2: Solve for </u><u><em>k</em></u>
We can use equality properties to help us rewrite the equation to get <em>k</em> as our subject:

Let's first <em>square both sides</em>:

$\displaystyle\begin{aligned}L = \sqrt{4kt - p} & \rightarrow L^2 = \big( \sqrt{4kt - p} \big) ^2 \\& \rightarrow L^2 = 4kt - p \\\end{aligned}$

Next, <em>add p to both sides</em>:

$\displaystyle\begin{aligned}L = \sqrt{4kt - p} & \rightarrow L^2 = \big( \sqrt{4kt - p} \big) ^2 \\& \rightarrow L^2 = 4kt - p \\& \rightarrow L^2 + p = 4kt \\\end{aligned}$

Next, <em>divide 4t by both sides</em>:

$\displaystyle\begin{aligned}L = \sqrt{4kt - p} & \rightarrow L^2 = \big( \sqrt{4kt - p} \big) ^2 \\& \rightarrow L^2 = 4kt - p \\& \rightarrow L^2 + p = 4kt \\& \rightarrow \frac{L^2 + p}{4t} = k \\\end{aligned}$

We can rewrite the new equation by swapping sides to obtain our final expression:

$\displaystyle\begin{aligned}L = \sqrt{4kt - p} & \rightarrow \boxed{k = \frac{L^2 + p}{4t}}\end{aligned}$

∴ we have <em>changed</em> the subject of the formula.

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Learn more about Algebra I: brainly.com/question/27698547

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Topic: Algebra I

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2 years ago

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blagie [28]

A is the correct answer

4 0

3 years ago

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