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3 years ago

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

Mathematics

2 answers:

damaskus [11]3 years ago

7 0

The answer is positive 5

skelet666 [1.2K]3 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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Answer:

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Step-by-step explanation:

(a)

Probability (A heart or a black card) = 13 + 26 / 52
Probability (A heart or a black card) = 39/52
Probability (A heart or a black card) = 3/4

(b)

Probability (A heart or a jack) = 13 + 3 / 52
Probability (A heart or a jack) = 16/52
Probability (A heart or a jack) = 4/13

(c)

Probability (A heart and the ace of clubs) = 13 + 1 / 52
Probability (A heart and the ace of clubs) = 14/52
Probability (A heart and the ace of clubs) = 7/26

(d)

Probability (A 9 or a jack) = 4 + 4 / 52
Probability (A 9 or a jack) = 8/52
Probability (A 9 or a jack) = 2/13

(e)

Probability (The 9 of hearts or a jack) = 1 + 4 / 52
Probability (The 9 of hearts or a jack) = 5/52

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