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sergiy2304 [10]
3 years ago
15

What is the slope and y intercept of the equation 9x + y + 18 = 0?

Mathematics
1 answer:
marusya05 [52]3 years ago
6 0
In order to read these directly from the equation it must be solved for y

9x+y+18=0
y=-9x-18
slope is coefficient of x, or-9
intercept is the constant, or-18
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Kara is building a sandbox shaped like a kite for her nephew. The top two sides of the sandbox are 29 inches long. The bottom tw
Tresset [83]
The wording is unclear without a diagram. As such, there are two possible cases and two possible answers.

Case 1: Diagonal \overline{DB} i<span><span>s formed by connecting the vertices formed by the meeting points of a 25-inch side and a 29-inch side. </span>
</span>Call the intersection point of \overline{DB} and \overline{AC} E. \overline{AC} bisects \overline{DB}, so DE=BE=20\text{ inches}. Since the diagonals of a kite are perpendicular to each other, \triangle AED and \triangle CED are both right triangles. One has a hypotenuse of 29, and the other has a hypotenuse of 25, but both share a leg of 20. Using the Pythagorean Theorem, we can get that the length of the other leg in the triangle with a hypotenuse of 29 is 21. Similarly, for the triangle with a hypotenuse of 25, the other leg has a length of 15. Together, these legs make up \overline{AC}, meaning AC=21+15=36 \text{ inches}, our final answer.

Case 2: Diagonal \overline{DB} i<span>s formed by connecting the vertices formed by the meeting points of the sides with equal lengths. 
</span>Call the intersection point of \overline{DB} and \overline{AC} E. We will focus on two triangles, namely \triangle ADE and \triangle ABE. Since diagonals intersect perpendicularly, these triangles are right triangles. One of them has a hypotenuse of 29, and the other has a hypotenuse of 25. They both share a leg that is half of \overline{AC} because \overline{DB} bisects \overline{AC}. Let AE=y and the non-shared leg of the right triangle with a hypotenuse of 29 equal x. Since DB=40, the non-shared leg of the other right triangle (the one with a hypotenuse of 25) has a length of 40-x. Using the Pythagorean Theorem, we can get the equations x^2+y^2=29^2 and (40-x)^2+y^2=25^2. These can simplify to x^2+y^2=841 and 1600-80x+x^2 + y^2=625. Isolating the term y^2, we can get y^2=841-x^2 and y^2=625-x^2+80x-1600. The latter can simplify to y^2=-975-x^2+80x. Using substitution, we can combine the two equations into one and get 841-x^2=-975-x^2+80x. We can simplify that to 80x=1816, meaning x=22.7. However, we are looking for 2y (y is only half of \overline{AC}). We can solve for y using the Pythagorean Theorem and the triangle with a hypotenuse of 29 and a leg of 22.7. We get y \approx 18.05, meaning \overline{AC}=2y \approx 36.1 \text{ inches}, our final answer.
3 0
4 years ago
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What is the name of a polygon with five sides?
irinina [24]
PENTAGON
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5 0
3 years ago
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18. El equipo de docentes del Área de Formación Humanística decide repartir 195 ejemplares de libros de lectura a 4 estudiantes
irina [24]

Answer:

Each of the students absent for 1, 2, 4 and 5 days get 57, 53, 45 and 40 copies of the the reading books respectively.

Step-by-step explanation:

English Translation

The team of teachers from the Humanistic Training Area decides to distribute 195 copies of reading books to 4 students previously classified on their own merits. But the distribution will be made taking into account absences from classes during the first cycle. How many books does each student receive if their absences have been 1; two; 4 and 5 days, respectively?

Solution

Because the more the number of days absent, the less the number of books each of the 4 students deserve, we have to employ an elaborate scheme.

If 195 copies are distributed equally between 4 People, each person gets 48.75 copies of the books.

Now, if we add another 48.75 copies of books to the total number of books, each person gets 60.9375 books.

But, we can then divide 48.75 extra books on top according to the number of days absent and subtract each person's number from the assumed 60.9375 books, with an extra 48.75 books.

Total number of days absent = 1 + 2 + 4 +5 = 12

(48.75/12) = -4.0625 copies for each absent day.

The student with only 1 absent day gets 60.9375 - 4.0625 = 56.875 copies = 57 copies

The student with 2 absent days, gets = 60.9375 - (2×4.0625) = 52.8125 copies = 53 copies

The student with 4 absent days, gets = 60.9375 - (4×4.0625) = 44.6875 copies = 45 copies

The student with 5 absent days, gets = 60.9375 - (5×4.0625) = 40.425 copies = 40 copies

Hence, each of the students absent for 1, 2, 4 and 5 days get 57, 53, 45 and 40 copies of the the reading books respectively.

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Answer:

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Step-by-step explanation:

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3 years ago
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