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3 years ago

Please help please help

Mathematics

1 answer:

alex41 [277]3 years ago

3 0

Answer:

Step-by-step explanation:

The sum of the angles of a triangle is 180

Let the unknown angle be x

94+45+x = 180

Combine like terms

139 +x = 180

Subtract 139 from each side

139+x-139= 180-139

x =41

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5+7 what strategy did you use doubles near doubles make 10 or my way think 5 and 7 are two apart

rusak2 [61]

Answer:

double plus two , two apart facts make ten extended strategy is used.

Step-by-step explanation:

Sum of 5 + 7 = 12 less two = 12; OR to make 10, I need to take 3 from the 5, add it to the 7 to make 10 and that leaves 2 from the 5. I add the 2 to the 10 I now have and that = 12.

8 0

3 years ago

If f(x)=3x^2-1 and g(x)=x+2, find (f+g)(x)

algol13

Answer:
(f+g)(x) = 3x^2 + x + 1

Explanation:
We are given that:
f(x) = 3x^2 - 1
g(x) = x + 2
To find (f+g)(x), all we have to do is add the above to functions as follows:
(f+g)(x) = f(x) + g(x)
= 3x^2 - 1 + x + 2
= 3x^2 + x + 1

Hope this helps :)

5 0

3 years ago

Read 2 more answers

A pole that is 3m tall casts a shadow that is 1.3m long. At the same time, a nearby building casts a shadow that is 41.75m long.

8090 [49]

Answer:We're looking for a,b such that

\dfrac{9x-20}{(x+6)^2}=\dfrac a{x+6}+\dfrac b{(x+6)^2}

Step-by-step explanation:

6 0

3 years ago

I need help with an area math question

Ede4ka [16]

Answer:

Step-by-step explanation:

Area of outer triangle = $\dfrac{4x*(4x+3)}{2}= 2x*(4x +3)$

= 2x*4x + 2x*3

= 8x² + 6x

Area of inner triangle= $\dfrac{2x*(2x+5)}{2}=x*(2x+5)=x*2x+x*5=2x^{2} + 5x$

Area of aluminium = area of outer triangle - area of inner triangle

= 8x² + 6x + 2x² + 5x

= 10x² + 11x

Area of 20 aluminum borders = 20*(10x² + 11x) = 200x² + 220x

b) x = 25 cm

Area of 20 aluminum borders = 200*25² + 220*25

= 200 * 625 + 220*25

= 125000 + 5500

= 130500 cm²

c) Area of inner triangle (Glass) = 5500 cm²

Cost of aluminium = 130500 * 0.06 = $ 7830

Cost of glass = 5500 * 0.03 = $ 165

Cost of making 20 windows = 7830 + 165 = $ 7995

7 0

3 years ago

Which equation is correct?

nika2105 [10]

Answer:

52 x 7= 50 x 7 + 2 x 7

Step-by-step explanation:

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2 years ago