49 rounded to the nearest ten

Please help!!!!!!!!!!!!!!!!!

rewona [7]

Answer:

tan Z = 3/4

Step-by-step explanation:

$\tan(Z) = \frac{21}{28} \\ \tan(Z) = \frac{3}{4}$

4 0

3 years ago

Find the standard form of the equation of the parabola with a focus at (-8, 0) and a directrix at x = 8

il63 [147K]

The best thing to do when finding conic equations from the focus and directrix is to sketch a little graph. When you do this, you can easily identify the vertex right in the middle and can determine if the parabola is vertical or horizontal since it must wrap around the focus. This way you know whether the x or the y is squared. When you sketch the focus and directrix, you will see the vertex is at (0,0) and the parabola is sideways, so the y is squared. now remember your formula is y^2=4px where p is the distance from the vertex to the focus, or you could write x=1/(4p)y^2. Now from 0 to -8 is -8 so that means 4p=-32. This gives you y^2=-32x or x=-1/32y^2. Thsi type of question will also be on your module exam and then the final exam so be sure to practice some:)

8 0

3 years ago

Please help me with this one question, and I'll upvote the brainliest answer

ra1l [238]

Answer: " x = 12 " .

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Step-by-step explanation:

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<u>Note</u>: If 2 (two) triangles are "similar" ; then their corresponding sides are "proportional".

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Since one of the sides [the "hypotenuse"] of one the triangles given ; shows the measurement containing an expression with a value of "x" — specifically; " 6x + 28 " ;

→ And since we want to solve for the value of "x" ; we use this "hypotenuse" of said particular triangle to set up a "proportion" with corresponding sides; so we can solve for "x" :

→ Set up proportions as a "ratio" ; or fraction:

→ 7:28::25:(6x + 28) ; Solve for "x" ;

Let us write this in the form of a "fraction" :

→ $\frac{7}{28} = \frac{25}{(6x+28)}$ ;

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<u>Note</u>:

→ Rewrite: " $\frac{7}{28}$ " ; by simplifying to:

" $\frac{1}{4}$ " ;

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→ Since: " $\frac{7}{28}$ " ;

= " (7÷7) / (28÷7) " ;

= " (1 /4) " ;

= " $\frac{1}{4}$ " .

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Now, rewrite the "proportion" ; as follows:

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$\frac{1}{4} = \frac{25}{(6x+28)}$ ;

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Now: "Cross multiply" ; that is:

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→ Given: " $\frac{a}{b} = \frac{c}{d}$ " ;

and: " b $\neq$ 0 " ; " d $\neq$ 0 " ;

→ Then: " a * d " = " b * c " .

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Likewise: " 1(6x + 28) = (4) * (25) " ;

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SImplify: " 6x + 28 = 100 " ; Solve for "x" ;

→ Subtract "28" from each side of the equation:

→ " 6x + 28 - 28 = 100 - 28 " ;

to get: → " 6x = 72 " ;

Now, divide each side of the equation by: " 6 " ;

to isolate "x" on one side of the equation; & to solve for "x" ; as follows:

→ " 6x = 72 " ;

→ 6x / 6 = 72 / 6 ;

to get:

→ " x = 12 " ;

→ which is the answer.

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Hope this helps!

Best wishes in your academic pursuits

— and within the "Brainly" community!

______________________________________________

5 0

3 years ago

The total cost 95 pens and 89 notebooks is RS 7434.The total cost of 1 pen and 1 notebook is 81.What the cost of 1 notebook?

Alex

Answer:

The cost of 1 note book = Rs 43.5

Step-by-step explanation:

Given in question as :

95 pens (P) + 89 notebook (N) total cost = Rs 7434

1 pen (P) + 1 (N) total cost = Rs 81

So, from above equation

95 pens (P) + 89 notebook (N) total cost = Rs 7434

1 × 95 pen (P) + 1× 95 notebook (N) total cost = Rs 81 × 95

Or, (95 pens (P) + 95 notebook (N) ) - (95 pens (P) + 89 notebook (N) ) = (7695 - 7434)

Or , 6 N = Rs 261

Or, N = $\frac{261}{6}$ = Rs 43.5

Hence the cost of 1 notebook is Rs 43.5 Answer

4 0

3 years ago

Use the diagram and equations below to match the following angles with their correct measures.

Tpy6a [65]

Answer:

If we are working in a coordinate plane where the endpoints has the coordinates (x1,y1) and (x2,y2) then the midpoint coordinates is found by using the following formula:

midpoint=(x1+x22,y1+y22)

Step-by-step explanation:

4 0

3 years ago