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3 years ago

25 + 20 + 45 + 34 + 21 =

Mathematics

2 answers:

Lana71 [14]3 years ago

3 0

Let's solve it step-by-step:

25 + 20 = 45

45 + 45 = 90

90 + 34 = 124

124 + 21 = 145

Therefore:

25 + 20 + 45 + 34 + 21 = 125

Hope it helped,

BioTeacher101

azamat3 years ago

3 0

It should be 145 because u can’t just add them up in pairs

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3 years ago

Prove that a triangle with the sides a - 1 cm to root under a

vivado [14]

Question is Incomplete, Complete question is given below.

Prove that a triangle with the sides (a − 1) cm, 2√a cm and (a + 1) cm is a right angled triangle.

Answer:

∆ABC is right angled triangle with right angle at B.

Step-by-step explanation:

Given : Triangle having sides (a - 1) cm, 2√a and (a + 1) cm.

We need to prove that triangle is the right angled triangle.

Let the triangle be denoted by Δ ABC with side as;

AB = (a - 1) cm

BC = (2√ a) cm

CA = (a + 1) cm

Hence,

${AB}^2 = (a -1)^2$

Now We know that

$(a- b)^2 = a^2+b^2 - 2ab$

So;

${AB}^2= a^2 + 1^2 -2\times a \times1$

${AB}^2 = a^2 + 1 -2a$

Now;

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Also;

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Now We know that

$(a+ b)^2 = a^2+b^2 + 2ab$

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${CA}^2 = a^2 + 1 +2a$

${CA}^2 = AB^2 + BC^2$

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Now In right angled triangle the sum of square of two sides of triangle is equal to square of the third side.

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4 0

3 years ago

1/6(a+12)= -4 please help because I don’t understand this

iogann1982 [59]

Answer:

a=-36

Step-by-step explanation:

1/6(a+12)=-4

1) Distribute <u>1/6</u> to a and 12:

1/6a+2=-4

2) Subtract 2 from both sides:

1/6a=-6

3) Multiply both sides by the reciprocal of 1/6: (6/1)

a=-36

Let me know if you have any confusion on how I reached the solution :)

3 0

3 years ago

Please can I have some more help sorry

sineoko [7]

Answer:

What are you asking?

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers