MATHEMATICS HIGH SCHOOL

The system of equations is coincident. What are the missing values?

-2x+5y=-12
-6x+____y=____

Answers

Answer 1
Answer: the equation is
-6x+15y=36, and you get the answer by multiplying the first equation by 3

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Solve the following proportion for u.
17/13=u/4

Answers

Answer:

u=5.23

Step-by-step explanation:

(17)/(13) =(u)/(4)\n13u=68~by~cross-multiplication\nu=5.23~rounded~to~the~nearest~hundreds

at a candy store, erika bought 3 kilograms of cinnamon red hots and 1 kilogram of gummy bears for $21.00. meanwhile, irene bought 3 kilograms of cinnamon red hots and 3 kilograms of gummy bears for $39.00. what is the cost of one kilogram of each type of candy?

Answers

If you would like to know the cost of one kilogram of each type of a candy, you can calculate this using the following steps:

1 kilogram of cinnamon red hots ... x = ?
3 kilograms of cinnamon red hots ... 3 * x = ?

1 kilogram of gummy bears ... y = ?
3 kilograms of gummy bears ... 3 * y = ?

Erika: 3 * x + y = $21.00
Irene: 3 * x + 3 * y = $39.00

3 * x + y = 21
3 * x + 3 * y = 39
_________________
3 * x + y - (3 * x + 3 * y) = 21 - 39
3 * x + y - 3 * x - 3 * y = - 18
- 2 * y = - 18      /(-2)
y = $9

3 * x + y = $21.00
3 * x = 21 - y
3 * x = 21 - 9
3 * x = 12     /3
x = $4

The correct result would be: 1 kilogram of cinnamon red hots cost $4 and 1 kilogram of gummy bears cost $9.

The sum of interior angle of a regular polygon is 1980 . Find its angle .

Answers

The sum of the angles of any polygon with 'n' sides is (n - 2) times 180 degrees.

1980 / 180 = 11 , so the polygon has 13 sides and 13 angles.

If the polygon is regular, then all the angles are equal.

Each interior angle is 1980/13 = 152.308 degrees (rounded)

How to add and subtract radians for trig

Answers

The same way you add and subtract any pair of fractions. You need to make sure the denominators are equal. Once they are equal, you can add or subtract the numerators and place the result over the common denominators.
the same way you add or subtract any pair of fractions, hope this helps (:

Write the equation of the line that passes through the points (3,1) and (-2,6)

Answers

slope = y2 - y1 / x2 - x1

6 - 1 / - 2 - 3

5 / - 5

- 1

y = mx + c

1 = - 1 * 3 + c

1 = - 3 + c

1 + 3 = c

c = 4

y = - 1x + 4

y = - x + 4

Andy is one-fourth as old as his grandfather, who is 76 years old. Write an equation to determine whether Andy is 19 or 22 years old.

Answers

We know that if we multiply Andy's age by four we obtain 76. Lets assume that Andy's age its x. so
4*x=76
Now we have to solve equation
4*x=76     /:4 divide both sides by 4
x=19 - its the answer
A=Andy
G=Andy's Grandfather

A*4=G
G=76
A*4=76
/4
a=19
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