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2 years ago

What value of x makes 3x+7=22

Mathematics

2 answers:

Snezhnost [94]2 years ago

6 0

Answer:

x=5

Step-by-step explanation:

3x+7=22

subtract 7 from both sides

3x=22-7

3x=15

divide both sides by 3

3x/3 = 15/3

x=5

Natalija [7]2 years ago

5 0

3x = 22-7

3x= 15

x= 15/3

x=5

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Step-by-step explanation:

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2 years ago

Read 2 more answers

If f(x) is an exponential function where f(-1.5) 26 and

mariarad [96]

Answer:

$f(10) = 1147.25$

Step-by-step explanation:

Given

$f(-1.5) = 26$

$f(5.5) = 7$

Required

f(10)

An exponential function is represented as:

$f(x) = ab^x$

$f(-1.5) = 26$ impleies that:

$26 = ab^{-1.5}$ --- (1)

$f(5.5) = 7$ implies that

$7 = ab^{5.5}$ --- (2)

Divide (2) by (1)

$26/7 = ab^{-1.5}/ab^{5.5}$

$3.71429 = b^{-1.5+5.5}$

$3.71429 = b^{4}$

Take 4th root

$b = 1.39$

Substitute $b = 1.39$ in $26 = ab^{-1.5}$

$26 = a * 1.39^{-1.5}$

$26 = a * 0.6102$

Solve for (a)

$a = 26/0.6102$

$a = 42.61$

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$f(10) = ab^{10}$

$f(10) = 42.61 * 1.39^{10}$

$f(10) = 1147.25$

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