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3 years ago

Help! 80 points! (picture included)

Mathematics

2 answers:

Illusion [34]3 years ago

8 0

Answer:

D. 10

Step-by-step explanation:

8x-14=5x+34

8x-5x=34+14

3x=48

x=48/3

x=16

8x-14+5y+16 = 180

8(16)-14+5y+16 = 180

128-14+5y+16=180

5y=180-128-16+14

5y=50

Y = 10

dedylja [7]3 years ago

5 0

Answer:

D is the answer

Step-by-step explanation:

AS IT IS MCQ

NO NEED OF STEP BY STEP EXPLAINATION

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Complete the square<br> x²-8x-65=0

FromTheMoon [43]

x=-5 and x=13

Step-by-step explanation:

Given equation is:

$x^2-8x-65=0$

Adding 65 to both sides

$x^2-8x-65+65=0+65\\x^2-8x=65$

Now to decide what to add

$8x = 2ab\\8x=2.x.b\\\frac{8x}{2x} = b\\b=4$

So we will add (4)^2 to both sides

$x^2-8x+(4)^2=65+(4)^2\\Using\ formula: (a^2-2ab+b^2)=(a-b)^2\\(x-4)^2=65+16\\(x-4)^2=81Taking\ square\ root\ on\ both\ sides\\\sqrt{(x-4)^2}=\sqrt{81}\\x-4=-9\ \ \ \ and\ x-4=9\\x=-9+4\ \ \ \ and\ \ \ x=9+4\\x=-5,\ x=13$

So the solution is:

x=-5 and x=13

Keywords: Completing Square, Variables

Learn more about quadratic equations at:

#LearnwithBrainly

5 0

4 years ago

There are 25 students in class 2-11 and 20% wear glasses. How many wear glasses?

ryzh [129]

Answer:

Five students wear glasses.

Step-by-step explanation:

20 percent of 25 is 5

4 0

3 years ago

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Are 5y=2x-5 and 5y-3x=1 parallel

alexandr1967 [171]

Convert to ax+by=c form
for
ax+by=c
and
dx+ey=f
a/d=b/e
then they are paralell

5y=2x-5
-2x+5y=-5

5y-3x=1
-3x+5y=1

compare
-2x+5y=-5
-3x+5y=1

-2/-3=5/5
2/3=1
false
they are not paralelll

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3 years ago

If (x) =7-3x, determine the value of x when f(x)=16.

melomori [17]

Answer:

f=16/7.3x

Step-by-step explanation:

Lets solve for f:

f(7.3)=16

Step 1:Divide both sides by 7.3x

7.3f/7.3x=16/17.3x

f=16/7.3x

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3 years ago

0.5 mi = 2, 640 ft<br> O True<br> False

8_murik_8 [283]

The answer is true, 1 mile is 5280 feet

8 0

3 years ago

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