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Maslowich
2 years ago
11

Solve. Use the discount equation

Mathematics
1 answer:
mote1985 [20]2 years ago
3 0

Answer:

\$ 400.

Step-by-step explanation:

In this question, S (sales price) and r (discount rate) are both given. The unknown is the regular price, R.

Rearrange the discount equation to solve for R in terms of S and r.

S = R - r\, R.

S = (1 - r)\, R.

Divide both sides by (1 - r):

\displaystyle \frac{S}{1 - r} = \frac{(1 - r)\, R}{1 - r}.

\begin{aligned}R &= \frac{S}{1 - r}\end{aligned}.

It is given that S = 320. A mark-down of 20\% is equivalent to a discount rate of r = 20 / 100 = 0.20. Substitute in S and r to find the value of R:

\begin{aligned}R &= \frac{S}{1 - r} \\ &= \frac{320}{1 - 0.2} \\ &= \frac{320}{0.8}  \\ &= 400\end{aligned}.

Thus, the regular price would be \$ 400.

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Which of the following applies the law of cosines correctly and could be solved to find m∠E? ANSWERS: A) cos E = 312 + 392 – 2(3
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This question is incomplete because the options were not properly written.

Complete Question

Which of the following applies the law of cosines correctly and could be solved to find m∠E? ANSWERS:

A) cos E = 31²+ 39² – 2(31)(39)

C) 56² = 39² – 2(39) ⋅ cos E

D) 56² = 31² + 39² – 2(31)(39) ⋅ cos E

Answer:

D) 56² = 31² + 39² – 2(31)(39) ⋅ cos E

Step-by-step explanation:

From the above diagram, we see are told to apply the law of cosines to solve for m∠E i.e Angle E

The formula for the Law of Cosines is given as:

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Because we have sides d , e and f and we are the look for m∠E the law of cosines would be:

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f = 31

56² = 39² + 31² - (2 × 39 × 31) × cos E

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