How do you know that calculating 80% of the regular price gives you the same result as subtracting 20% from the regular price

Mathematics

1 answer:

frosja888 [35]3 years ago

6 0

80+20 equals 100. Brainliest!!!!!!

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after 8% discount from the list price, the sale price price of a poster was $17.48. what was the list price of poster.

Ludmilka [50]

Well the answer would be $18.8784 but if you want it to be shorter it would be $18.88 because you multiply 17.48 and 0.08 and get 1.3984 and then you add it to $17.48

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3 years ago

Find 150% of 90<br><br><br> Please help me

maksim [4K]

Answer:

225

Step-by-step explanation:

mark me as brainliest pls i need it

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2 years ago

Read 2 more answers

Write down the quadratic equation whose roots are $x = -7$ and $x = 1,$ and the coefficient of $x^2$ is 1. Enter your answer in

pav-90 [236]

<h2>Steps:</h2>

So firstly, since we know that the coefficient of x² is 1, this means that this is our base equation:

y = x² + bx + c

Now, since we know that the roots are -7 and 1, set y = 0 and set x = -7 and 1 and simplify:

$0=(-7)^2+b(-7)+c\\0=49-7b+c\\-49=-7b+c\\\\0=1^2+b(1)+c\\0=1+b+c\\-1=b+c\\\\-49=-7b+c\\-1=b+c$

Now with this, we can set up a system of equations to solve for b and c. For this, I will be using the elimination method. For this, subtract the 2 equations:

$\begin{alignedat}{2}-49&=-7b+c\\-(-1&=b+c)\\-48&=-8b\end{alignedat}$