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otez555 [7]
3 years ago
10

Please helppp!!!

Mathematics
1 answer:
coldgirl [10]3 years ago
7 0

Answer:

The perimeter is 27 km

The area is 21 km^2

Step-by-step explanation:

The perimeter of a triangle will just be all of the sides added up.

12 + 9 + 6 = 27 km

The area of a triangle is:

A = 1/2 * base * height

The base is 6 km, and the height is 7 km. Substituting the values in and solving, we get:

A = 1/2 * 6 * 7

A = 3 * 7

A = 21 km^2

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4x -5y=17 solve for y
Mariana [72]

Answer:

Move all terms that don't have  "y " in it to the right side and solve.

y =− 17 /5 + 4 x /5

Step-by-step explanation:

7 0
3 years ago
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The ratio of boys to girls in a class is 4:5 what fraction of teh class are boys
GalinKa [24]

Answer:

4/9

Step-by-step explanation:

If you add the ratios, it gives you the total, so 4 + 5 = 9.  9 total students.  Since boys is represented by 4, then 4/9 is the fraction for boys and 5/9 is the fraction for girls.

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4 years ago
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Find the nature of the roots of the roots of the equation (x-705)(x-795)+800(x-750)(x-835)=0.
alexandr402 [8]

Answer:

B

Step-by-step explanation:

If you are allowed to use a graphing calculator, this can solve a lot of time. Graphing y = (x - 705)(x - 795) + 800(x - 750)(x - 835) gets us a parabola with x-intercepts of 749.97 and 834.924.

These roots are real and distinct, or choice B.

If you aren't allowed to use a graphing calculator, you can expand and combine like terms to get 801x^2 − 1269500x + 501560475. Looking at the discriminant, we see that (−1269500)^2 - 4*801*501560475 = 4630488100 is greater than 0 and not a perfect square, so it is real and distinct, or choice B.

I hope that helps!

5 0
3 years ago
20 equals 5 times negative 3 plus x
kotykmax [81]

Answer:

20=5*-3+x or 20=-15+x or 35=x

8 0
4 years ago
The carnival fundraiser at Westville Elementary School raised $300 on Friday. On Saturday, the carnival will raise 480 percent o
Masteriza [31]

Answer:

B,C,F

Step-by-step explanation:

Hope this helps i am doing the same test high school and college questions in the sixth grade!?!

                               

7 0
3 years ago
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