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3 years ago

Please help me now please I will mark you brainliest

Mathematics

1 answer:

maxonik [38]3 years ago

5 0

Answer:

$BC = 15.01$

Step-by-step explanation:

Angle A is given.

For angle A, BC is the opposite leg.

For angle A, AC is the adjacent leg.

The trig ratio that relates the opposite leg to the adjacent leg is the tangent.

In general, for angle X,

$\tan X = \dfrac{opp}{adj}$

In our problem,

$\tan A = \dfrac{BC}{AC}$

$\tan 65^\circ = \dfrac{BC}{7}$

$BC = 7 \tan 65^\circ$

$BC = 15.01$

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brittany's first four quiz grades are 78 81 69 and 94 what would her next quiz score need to be in order to have a mean score of

mina [271]

The mean is the sum of all numbers divided by the number of numbers. We can set up an equation:

$\sf\dfrac{78+81+69+94+x}{5}=79$

Where 'x' is the next quiz score she need. Solve for 'x'. Multiply 5 to both sides:

$\sf 78+81+69+94+x=395$

Add:

$\sf 322+x=395$

Subtract 322 to both sides:

$\boxed{\sf x=73}$

So her next quiz score needs to be 73 in order to have a mean score of 79 on all her quizzes.

7 0

4 years ago

Read 2 more answers

Determine which numbers the equations can be multiplied by to create opposite terms of the x-variable. 1 2 x − 1 4 y = −3 − 1 3

Julli [10]

In the elimination method one variable is eliminated from the system of equation to find the value of other.

To create the opposite terms of the x-variable-

First equation be multiplied by the number 12.
Second equation be multiplied by the number 13.

<h3>What is elimination method?</h3>

To solve the system of equation and find the value of the variables, the elimination method is used.

In this method one variable is eliminated from the system of equation to find the value of other.

Given information-

The system of equation given in the problem is,

$12x-14y=-3$ ......1

Let the above equation as equation 1.

The second equation given in the problem is,

$-13x+23y=5$ ......2

Let the above equation as equation 2.

To eliminate the x term, make the coefficient of x of both the equation equal.

It can be done by multiply the coefficient of x term of first equation to second equation and coefficient of x term of second equation to first equation.

As the coefficient of x of the equation 1 is 12. Thus multiply second equation with 12. Thus,

$12\times(-13x+23y)=12\times5$