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3 years ago

Expand and simplify 5(2x-1) + 2(3x-6) i need to do it on maths watch

Mathematics

2 answers:

shepuryov [24]3 years ago

6 0

Let's split this up to make it easier.

Let's expand 5(2x - 1) first.

Multiply 5 by 2x and - 1

5 × 2x = 10x

5 × -1 = -5

Now we have 10x - 5

Let'd do the other side

Multiply 2 by 3x and -6

2 × 3x = 6x

2 × -6 = -12

Now we have 6x - 12

Let's combine both sides now.

(10x - 5) + (6x - 12)

Combine like terms:

10x + 6x = 16x

-5 + -12 = -17

Your final answer is 16x - 17

Hope I helped! Message me if you have any questions

mash [69]3 years ago

3 0

Expand

10x - 5 + 6x - 12

Collect like terms

(10x + 6x) + (-5 - 12)

Simplify

16x - 17

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Step-by-step explanation:

a). $\frac{5\pm\sqrt{-4}}{3}$ = $\frac{5}{3}\pm \frac{\sqrt{-4}}{3}$

= $\frac{5}{3}\pm\frac{2\sqrt{(-1)} }{3}$

= $\frac{5}{3}\pm\frac{2i}{3}$ [Since, i = $\sqrt{(-1)}$ ]

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= $5\pm \frac{4\sqrt{-1}}{2}$

= 5 ± 2i [Since, i = $\sqrt{(-1)}$ ]

c). $\frac{-3\pm \sqrt{-144}}{6}$ = $-\frac{3}{6}\pm \frac{\sqrt{-144}}{6}$

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3 years ago

Lin ran 2 3/4 miles in 2/5 of an hour, Noah ran 8 2/3 miles in 4/3 of an hour, how far would Lin run in 1 hour?

Marizza181 [45]

Answer:

$6\frac{7}{8}\ miles$

Step-by-step explanation:

Given that Lil's distance in 2/5 hrs is 2 3/4hrs

-Let x be the distance ran in 1 hr.

#We equate and cross multiply to solve for x as follows:

$\frac{2}{5}\ hrs=2\frac{3}{4}\\1\ hr=x\\\\\therefore x=2\frac{3}{4}/\frac{2}{5}\\\\=6\frac{7}{8}\ miles$

Hence, Lil can run 6 7/8 miles in 1 hr.

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