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4 years ago

Can you please solve by substitution????? And show the steps please

Mathematics

1 answer:

kompoz [17]4 years ago

5 0

Plug second into the first.

2x + (-5 - 2x) = 5
2x - 5 - 2x = 5
2x - 2x = 10
0 = 10

No solution.

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1/2x-2/3>3 enter your answer using interval notation

Nata [24]

So basically u keep the x on one side and the rest on the other. Get a common denominator. to get rid of the half u times both sides by 2.
hope this helps

7 0

3 years ago

4(a + 10) = 80 find a

Harman [31]

Answer:

Step-by-step explanation

4(a+10) = 80

4a+40=80

4a=40

a=10

6 0

3 years ago

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Find the coordinates of the midpoint M of ST.Then find the distance between points S and T.Round the distance to the nearest ten

Norma-Jean [14]

Answer:

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Step-by-step explanation:

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6 0

4 years ago

Pls help it’s due tn

OverLord2011 [107]

Answer:

94 for the first one and 130 for the second

Step-by-step explanation:

Since A=6 and B=4

For the first one

13(6)+ 4(4)

78+16=94

For the second one

(6+4)*13

(10)*13= 130

8 0

4 years ago

The length of a shadow of a tree is 150 feet when the angle of elevation of the sun is 39°. Approximate the height of the tree.

fomenos

Answer:

The height of tree is approximately 121.5 feet.

Step-by-step explanation:

We are given following in question:

Length of shadow = 150 feet

Angle of elevation of the sun =

$\theta = 39^\circ$

The tree and the shadow forms a right angled triangle.

Thus, with the help of trigonometric relation, we can write:

$\tan \theta = \dfrac{\text{Height of tree}}{\text{Length of shadow}}$

Let x feet be the height of tree.

Putting all the values, we get,

$\tan 39^\circ = \dfrac{x}{150}\\\\0.80978 = \dfrac{x}{150}\\\\\Rightarrow x = 150\times 0.80978\\\Rightarrow x = 121.467 \approx 121.5$

Thus, the height of tree is approximately 121.5 feet.

6 0

4 years ago