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3 years ago

A pair of jeans Is $36.99 and they are on sale for 20% off. What is the sale price?

Mathematics

2 answers:

Pani-rosa [81]3 years ago

6 0

Answer:

$29.59

Step-by-step explanation:

100% - 20% = 80%

36.99 x 0.80 = $29.59

Bad White [126]3 years ago

3 0

Answer:

i think its $20.40 im so sorry if im wrong

Step-by-step explanation:

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3 years ago

Use Hooke's Law to determine the work done by the variable force in the spring problem. A force of 450 newtons stretches a sprin

vlada-n [284]

Answer:

The work done is 202.50Nm

Step-by-step explanation:

Given

$F =450N$

$x_1 = 30cm$

$x_2 = 60cm$

Required

The work done

First, we calculate the spring constant (k)

$F = kx_1$

$450N = k *30cm$

$k = \frac{450N}{30cm}$

$k =15N/cm$

So:

$F = kx_1$

$F(x) = 15x$

The work done using Hooke's law is:

$W =\int\limits^a_b {F(x)} \, dx$

This gives:

$W =\int\limits^{60}_{30} {15x} \, dx$

Rewrite as:

$W =15\int\limits^{60}_{30} {x} \, dx$

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$W =15 \frac{x^2}{2}|\limits^{60}_{30}$

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$W =\frac{20250Nm}{100}$

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