2 years ago

Find x if f(x) = 2x + 7 and f(x) = -1.

Mathematics

2 answers:

damaskus [11]2 years ago

7 0

The answer is positive 5

skelet666 [1.2K]2 years ago

5 0

Answer:

$x=-4$

Step-by-step explanation:

We are given the function:

$f(x)=2x+7$

And we want to find x when f(x) = -1.

Substitute:

$-1=2x+7$

Subtract seven from both sides:

$2x=-8$

Divide both sides by two. Hence:

$x=-4$

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Usimov [2.4K]

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angle2=77°
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5 0

3 years ago

Barack walks 2 kilometers south and then x kilometers east. He ends 5 kilometers away from his starting position. Find x

amid [387]

Answer:

4.6 km

Step-by-step explanation:

-This is a Pythagorean Theorem problem where the distances walked are effectively the base and height of the imaginary right triangle thereof.

#Apply Pythagorean theorem to solve:

$b^2+h^2=H^2\\\\2^2+x^2=5^2\\\\x^2=5^2-2^2=21\\\\x=\sqrt{21}\\\\x=4.58\ km$

$\approx 4.6\ km$

Hence, the distance x is 4.6 km

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3 years ago

PLEASE HELP ME 100!!! POINTS A conjecture and the flowchart proof used to prove the conjecture are shown.

boyakko [2]

Answer:

Add the two angles: 43° + 47° = 90°.

Step-by-step explanation:

A right triangle has an angle that equals 90°. Complementary angles equal 90°. Therefore, if you add these two angles, you will know whether or not △ABC is a right triangle. Triangle △ABC is broken up into two angles, m∠ABD and m∠DBC. When the measures m∠ABD and m∠DBC are added together, they equal 90°, and thus, form a complementary angle.

Hope this helps,

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