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3 years ago

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Mathematics

1 answer:

kramer3 years ago

5 0

Answer:

can you send a picture please so i can see it?

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Evaluate the expression below when x = 7 and y = 3.5: 2x + 5y

adell [148]

Answer:

31.5

Step-by-step explanation:

2(7)+5(3.5)

14+17.5

31.5

3 0

3 years ago

Mike wants to work out the height of a tree which has a fence around it. From A he sees that the angle of elevation of the top i

larisa [96]

Answer: 13.8 m

Step-by-step explanation:

Given

From point A, angle of elevation is $19^{\circ}$

From point B which is 18 m closer, it changes to $32^{\circ}$

Suppose the height of tree is h

From figure, we can write

$\Rightarrow \tan 32=\dfrac{h}{x}\\\\\Rightarrow h=x\tan 32^{\circ}$

Similarly

$\Rightarrow \tan19^{\circ}=\dfrac{h}{x+18}\\\\\Rightarrow h=(x+18)\tan 19^{\circ}\\\text{Substitute the value of h}\\\Rightarrow x\tan 32^{\circ}=x\tan 19^{\circ}+18\tan 19^{\circ}\\\Rightarrow x(\tan32^{\circ}-\tan 19^{\circ})=18\tan 19^{\circ}\\\\\Rightarrow x=\dfrac{18\tan 19^{\circ}}{\tan32^{\circ}-\tan 19^{\circ}}\\\\\Rightarrow x=22.09\approx 22.1\ m$

Deduce the value of h

$\Rightarrow h=22.092\times \tan 32^{\circ}\\\Rightarrow h=13.8\ m$

Thus, the height of the tree is 13.8 m

5 0

3 years ago

The sum of two numbers is 25 one number is 5 less than the other number

elixir [45]

15+10
i believe this is right

4 0

3 years ago

What is the area of the triangle?

Strike441 [17]

Answer:

Step-by-step explanation:

base (b) = 8

height (h) = 6

A = bh/2

= 8x6/2

= 48/2

= 24

Therefore the area is 24 square units

3 0

4 years ago

Which equation represents the graph? points: (0,4) (3,4)

kicyunya [14]

Answer:

Step-by-step explanation:

A) Incorrect. x = 4 means that all points on the line must have x coordinate equal to 4. Neither points satisfy this.

B) Incorrect. We can rewrite the equation to be y=x/4. If we calculate the slope between the two points we get a slope of 0, not 1/4.

C) Incorrect. If y = 3, all points must have y coordinate equal to 3. Neither points satisfy this.

D) Correct. If y = 4, all points must have y coordinate equal to 4. Both points satisfy this.

4 0

3 years ago