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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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Write expression using the distributive property to find the product of 9 x82

irga5000 [103]

Answer:

Step-by-step explanation:

9 * 82 = ( 10-1) * 82

= 10*82 - 1 *82

= 820 - 82

= 738

5 0

2 years ago

How do you solve for x? <img src="https://tex.z-dn.net/?f=%20log_%7B6%7D%2836%29%20%20%3D%205x%20%2B%206" id="TexFormula1" ti

Paladinen [302]

The value of x in the given equation is $-\frac{4}{5}$

From the question,

We are to solve the given equation

The given equation is

$log_{6}(36) = 5x +6$

This becomes

$log_{6}(6^{2} ) = 5x +6$

From one of the laws of logarithms, we have that

$log_{x}(x^{2} ) = 2log_{x}(x)$

and

$log_{x}(x) = 1$

∴ $log_{6}(6^{2} ) = 5x +6$ becomes

$2log_{6}(6) = 5x +6$

and

$2(1)= 5x +6$

$2 = 5x +6$

Now, subtract 6 from both sides

$2-6 = 5x +6-6$

$-4 = 5x$

∴ $x = -\frac{4}{5}$

Hence, the value of x in the given equation is $-\frac{4}{5}$

Learn more on solving equations here: brainly.com/question/11802986

4 0

2 years ago

Read 2 more answers

An investor has an account with stock from two different companies. Last year, his stock in Company A was worth $1790 and his st

stiv31 [10]

Answer:

20.7%

Step-by-step explanation:

Amount of stock increased in Company A = 20% of 1790

= 0.20 * 1790 = $ 358

Investor's stock in company A this year = 1790 + 358 = $ 2148

Amount of stock increased in Company B = 22% of 1000

= 0.22 * 1000= $ 220

Investor's stock in company B this year = 1000 + 220 = $ 1220

Total amount in investor's stock account = 2148 + 1220 = $ 3368

Increased amount = 3368 - 2790 = $ 578

Increase percentage = $\frac{578}{2790}*100$ = 20.71

= 20.7%

7 0

3 years ago

Read 2 more answers

Solve by graphing y=-3x+3 y=2x-7

Anastasy [175]

The answer is C.
-3*2+3=-3
2*2-7=-3.
hope this helps!

4 0

3 years ago

Three universities receive endowments totaling 110 million dollars. Northern U receives twice as much as wester U. Eastern Us en

puteri [66]

Answer:

Western U gets 20 million

Norther U gets 40 million

Eastern U gets 50 million

Step-by-step explanation:

We need to find the amount each university gets.

Let

Northern U get n

Western U get w

Eastern U get e

We can write equations from the given word problem:

n + w + e = 110

and

n = 2w

e = n + w - 10

Putting 2nd in 3rd, we get:

e = 2w + w - 10

e = 3w - 10

Now putting this and 2nd in first, we solve for w:

n + w + e = 110

2w + w + 3w - 10 = 110

6w = 120

w = 20

AND n = 2 (20) = 40

AND e = 3(20) - 10 = 50

So,

Western U gets 20 million

Norther U gets 40 million

Eastern U gets 50 million

5 0

3 years ago