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3 years ago

(25 points) Can someone please solve this I just need to see how its solved to understand

Mathematics

1 answer:

aleksley [76]3 years ago

4 0

x = total amount of students in 8th Grade.

we know only one-thrid of the class went, so (1/3)x or x/3 went.

we also know 5 coaches went too, and that the total amount of that is 41.

$\bf \stackrel{\textit{one third of all students}}{\cfrac{1}{3}x}+\stackrel{\textit{coaches}}{5}=\stackrel{\textit{total}}{41}\implies \cfrac{x}{3}+5=41\implies \cfrac{x}{3}=41-5 \\\\\\ \cfrac{x}{3}=36\implies x=3(36)\implies x=108$

now, to verify, well, what do you get for (108/3) + 5?

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Find the error and explain why its wrong

UNO [17]

Answer:

The last part.

Step-by-step explanation:

The error is only at the last part. Basically the answer part.

The answer should be —

$13 \sqrt{5}$

We don't multiply the square roots when adding or subtracting. That'd contradict the rules.

Here, we let the square root of five as x-term.

$\sqrt{5} = x$

$4 \sqrt{5} + 9 \sqrt{5} = 4x + 9x$

As we add up, we would get 13x. Thrn we convert x-term back to square root of five.

The answer would be —

$13x \\ x = \sqrt{5} \\ 13 \sqrt{5}$

Remember that we don't multiply the square roots when adding or subtracting.

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Paladinen [302]

Answer:

B/second option

Step-by-step explanation:

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iVinArrow [24]

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3 years ago

In triangle ABC, AB = 90 in., BC = 80 in., and angle B measures 50°. What is the approximate perimeter of the triangle?

Monica [59]

Answer:

The answer to your question is Perimeter = 287.3 in

Step-by-step explanation:

AB = 90 in

BC = 80 in

∠B = 50

Perimeter = ?

Process

1.- We need to find AC using Law of sines

$\frac{sin A}{80} = \frac{sin 50}{90}$

$sin A = \frac{80}{90} sin 50$

$sin A = 0.68$

A = 42.9 ≈ 43

The sum of the internal angles in a triangle equals 180°

A + B + C = 180°

43 + B + 50 = 180

B = 180 - 43 - 50

B = 87°

$\frac{AC}{Sin 87} = \frac{90}{sin 50}$

$AC = 90 \frac{sin 87}{sin 50}$

AC = 117.3

2.- Find the perimeter

Perimeter = AB + BC + AC

Perimeter = 90 + 80 + 117.3

Perimeter = 287.3 in

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3 years ago

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Which statements are true for solutions when there is a system of two linear equations in two variables? Select all that apply.

monitta

Answer: A system of linear equations consists of two or more linear equations made up of two or more variables, such that all equations in the system are considered simultaneously.

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(

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that satisfies each equation independently. Graphically, solutions are points at which the lines intersect.

Key Terms

system of linear equations: A set of two or more equations made up of two or more variables that are considered simultaneously.

dependent system: A system of linear equations in which the two equations represent the

same line; there are an infinite number of solutions to a dependent system.

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independent system: A system of linear equations with exactly one solution pair

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Step-by-step explanation:

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2 years ago

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