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Lina20 [59]
3 years ago
8

PLEASE HELP ITS MATH

Mathematics
2 answers:
enot [183]3 years ago
8 0

Answer:

C. -x^2-x+9

Step-by-step explanation:

Combine Like Terms:

what we have 2x^2+6x−7x+8−3x^2+1

=(2x^2−3x^2)+(6x+−7x)+(8+1)

=−x^2+−x+9

Nesterboy [21]3 years ago
7 0

Answer:

-x^2-x+9

Step-by-step explanation:

2x^{2} +6x-7x+8-3x^2+1

2x^{2} +6x-7x+9-3x^2     Add 8 + 1

Combine like terms

2x^{2} +6x-7x+9-3x^2     6x-7x=-x

2x^2-x+9-3x^2

Combine like terms

2x^{2} -x+9-3x^2              2x^2-3x^2

-x^2-x+9          

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TRUE/FALSE. the lengths of the altitude of a hypotenuse is the geometric mean of the lengths of the segments of each of the legs
vitfil [10]

In Right Angled Triangle the lengths of the altitude of a hypotenuse is the geometric mean of the lengths of the segments of each of the legs is TRUE

What is a Right angled triangle?

A triangle is said to be right-angled if one of its angles is exactly 90 degrees. The total of the other two angles is 90 degrees. Perpendicular and the triangle's base are the sides that make up the right angle. The longest of the three sides, the third side is known as the hypotenuse.

The right triangle's three sides are interconnected. The Pythagorean Theorem explains this connection. This theorem states that the Hypotenuse2 = Perpendicular2 + Base2.

  • The right angle, or 90°, is always one angle.
  • The hypotenuse is the side with the 90° angle opposite.
  • The longest side is always the hypotenuse.
  • The other two inner angles add up to 90 degrees.

Let assume a right-angled triangle ABC, right-angled at A.

Let AD be the perpendicular drawn from vertex A on hypotenuse BC, intersecting BC at D.

Now, In right-angle triangle ABC,

By using Pythagoras Theorem, we have

AB^2 +AC^2 = BC^2

Now, In right-angle triangle ABD

Using Pythagoras Theorem, we have

AB^2 =AD^2 + BD^2

Now, In right-angle triangle ACD,

AC^2 = AD^2+CD^2

On adding equation (2) and (3), we get

AB^2 +AC^2 = 2AD^2+ BD^2 +CD^2

Now, using equation (1), the above equation can be rewritten as

2AD^2 +CD^2+BD^2 = BC^2

can be further rewritten as

2AD^2 +BD^2 +CD^2 = (CD+BD)^2\\\\BD^2 +CD^2 +2(BD)(CD)=2AD^2 +BD^2 +CD^2\\\\(BD)(CD)=AD^2

AD is geometric mean of BD and CD

Learn more about Right angled triangle from the link below

brainly.com/question/3770177

#SPJ4

8 0
2 years ago
3(2−0.9h)+(−1.3h−4)<br><br> Please help!!!!!!!!!!!!!!!!!
murzikaleks [220]

<span>3⋅2−3⋅0.9h+1.3h−4⇒</span>

<span>6−2.7h+1.3h−4⇒</span>

<span>6−4−2.7h+1.3h⇒</span>

<span>2−1.4<span>h</span></span>

<span><span>This is the answer.</span></span>

6 0
3 years ago
Read 2 more answers
the sum of two numbers is 70. the larger number is five less than twice the smaller number . what are the two numbers
earnstyle [38]
X+y=70
x=2y-5
x=larger number
y=smaller number
now plug in the value of x to only have one variable in the equation...
Way to solve for y:
(2y-5)+y=70
3y-5=70
add 5 on both sides...
3y=75
divide by 3 on both sides
y=25
1st way to solve for x:
now plug in y in the original equation...
x+25=70
subtract 25 on both sides...
x=45
2nd way to solve for x:
plug in y for the second equation...
x=25(2)-5
x=50-5
x=45
answer: the two numbers are 45 and 25.

3 0
3 years ago
3/4 of analisa's friends came to her birthday party. express this fraction as a percant and a decimal.
icang [17]

Answer:

0.75 And 75%

Step-by-step explanation:

If 3/4 came then 25, 50, 75, 100 what is the 3rd number of of those 4

8 0
3 years ago
A farm stand sells apples pies and jars of applesauce. The table shows the number of apples needed to
lara31 [8.8K]

Answer:

IF I am correct, 5

Step-by-step explanation:

98/ 18

8 0
3 years ago
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