3 years ago

What is the solution for this equation? |-4x +7 | = 15

Mathematics

1 answer:

OverLord2011 [107]3 years ago

5 0

X= -2 because since it has the absolute value symbol it’s actually 4 and not -4 so 4x2= 8 and 8+7=15

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The original cost of a laptop computer was x dollars. The expression 0.36 represents the value of the laptop today. Choose two e

kozerog [31]

Answer:

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Step-by-step explanation:

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3 years ago

My brother is 5 years older than me. My sister is 3 years younger than me. How old was my brother when my sister was m years old

LenaWriter [7]

hmmmm

b = brother

s = sister

a = my age

so your brother is 5 years older, b = a + 5.

and your sister is 3 years younger, s = a - 3.

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$\bf \begin{cases} b=a+5\implies b-5=\boxed{a}\\ s=a-3\\[-0.5em] \hrulefill\\ s=\boxed{b-5}-3\implies s=b-8 \end{cases} \\\\\\ \stackrel{\textit{if your sister is "m" years old, say s = m}}{m=b-8}\implies \blacktriangleright m+8=b \blacktriangleleft$