3 years ago

If f(x) = 5x + 40, what is f(x) when x = -5? оооо

Mathematics

1 answer:

mote1985 [20]3 years ago

8 0

I think it’s 15..
cause you replace the x with -5 and solve the problem

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3 years ago

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3 years ago

What is 7 and 1/2 and 1 and 9/10 simplified?

Elena-2011 [213]

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3 years ago

A small plane and a large plane are 6.8km from each other, at the same altitude (height). From an observation tower, the two air

Lemur [1.5K]

Answer:

7.9km

Step-by-step explanation:

(a)See attached for the diagram representing this situation.

(b)

In Triangle ABC

$\text{Using Law of Sines}\\\dfrac{\sin A}{a}=\dfrac{\sin C}{c} \\\dfrac{\sin A}{5.2}=\dfrac{\sin 58^\circ}{6.8} \\\sin A=5.2 \times \dfrac{\sin 58^\circ}{6.8}\\A=\arcsin (5.2 \times \dfrac{\sin 58^\circ}{6.8})\\A=40.43^\circ$

Next, we determine the value of Angle B.

$\angle A+\angle B+\angle C=180^\circ\\40.43+58+\angle B=180^\circ\\\angle B=180^\circ-(40.43+58)\\\angle B=81.57^\circ$

Finally, we find b.

$\text{Using Law of SInes}\\\dfrac{b}{\sin B}=\dfrac{c}{\sin C} \\\dfrac{b}{\sin 81.57^\circ}=\dfrac{6.8}{\sin 58^\circ} \\b=\dfrac{6.8}{\sin 58^\circ} \times \sin 81.57^\circ\\b=7.9km $ (to the nearest tenth of a kilometer)$

The distance between the small plane and the observation tower is 7.9km.

8 0

4 years ago

X - y - 2 = 0<br> x + y + 4 = 0

adell [148]

Answer: x= -1, y= -3

Step-by-step explanation

solve like a system of equations

x-y-2 = 0

x+y+4=0

------------

2x+2=0, 2x= -2, x= -1, then plug that back into either equation

-1+y+4=0, y+3=0, y= -3

4 0

3 years ago