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3 years ago

I need help please tell me the answer you will get 30 points too. I. 7x+42

2 answers:

8 0

If you have a total that the expression is equal to, you would basically subtract 42 from the total and then divide by 7 to get x.

noname [10]3 years ago

7 0

What exactly are you looking for

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The sum of two numbers is 30 and their difference is 20

Zanzabum

5 and 25

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

Solve the equation for the given domain. Graph the solution set. 3x – y = 1 for x = {–1, 0, 1, 3}

Marat540 [252]

I think you meant "evaluate the given equation."

3x – y = 1 becomes 3x-1=y. Then: 3(-1)-1 = y = -4 when x=-1.

The y-values for {0, 1, 3} are {-1, 2, 8}

3 0

3 years ago

Two buildings are facing each other on a road of width 12 metre . From the top of the first building, which is 10 metre high , t

Karo-lina-s [1.5K]

Answer:

$\displaystyle 10 + 12\sqrt{3}$ metres

Step-by-step explanation:

You are finding the height of the building with an angle of elevation, therefore we need to solve for EC to add it to BA [10 metres] and use TRIGONOMETRIC RATIOS to arrive at our conclusion. Just in case you have forgotten what they were, here they are:

$\displaystyle \frac{OPPOSITE}{HYPOTENUSE} = sin\:θ \\ \frac{ADJACENT}{HYPOTENUSE} = cos\:θ \\ \frac{OPPOSITE}{ADJACENT} = tan\:θ \\ \frac{HYPOTENUSE}{ADJACENT} = sec\:θ \\ \frac{HYPOTENUSE}{OPPOSITE} = csc\:θ \\ \frac{ADJACENT}{OPPOSITE} = cot\:θ$

We can now solve for EC:

$\displaystyle cot\:60 = \frac{12}{EC} → ECcot\:60 = 12 \\ \\ \frac{ECcot\:60}{cot\:60} = \frac{12}{cot\:60} → 12\sqrt{3} = EC$

OR

$\displaystyle tan\:60 = \frac{EC}{12} → 12tan\:60 = EC → 12\sqrt{3} = EC$

Now that you have solved for EC, you can now add it to your original 10 metres to get $\displaystyle 10 + 12\sqrt{3}$ metres. As a decimal, you would get $\displaystyle 30,78460969...$ metres. You can go ahead and round this off if necessary.

** The reason why the cotangent [or tangent] ratio was used was because EA is equivalent to DB by the definition of a rectangle. It has two pairs of parallel and congruent sides with four right angles. Plus, that is the adjacent side of the triangle, while EC is the opposite side of the triangle, so we knew our ratios were correct.

I am joyous to assist you at any time.

8 0

3 years ago

A box contains five slips of paper, marked $1, $1, $10, $25, and $25. The winner of a contest selects two slips of paper at rand

gladu [14]

Answer:

A random variable is a variable whose values are unknown. Random variable are mostly used in regression analysis to determine the statistical relationship between two entities.

Step-by-step explanation:

There are two types of random variable;

1. The discrete random variable and

2. The continuous random variable.

5 0

3 years ago

Please help me anyone

shutvik [7]

Step-by-step explanation:

1. Draw the bottom line EF with a ruler.

2. Use a protractor and draw 2 long lines at 50 degrees, one from point E and one from F and make sure the two lines intersect.

7 0

3 years ago