Ask question

Ask question

All categories

2 years ago

10

I need help, please and thank you

1 answer:

borishaifa [10]2 years ago

5 0

Answer:

See below ↓

Step-by-step explanation:

<u>Problem</u>

<u /> $\frac{5x}{x+7} + \frac{7}{x}$

<u>Work</u>

<u /> $\frac{5x(x)+7(x+7)}{x(x+7)}$
$\frac{5x^{2} +7x+49}{x(x+7)}$
The student's mistake was that instead of taking x(x + 7) as the LCM (Least Common Multiple), he took x + 7, which is not possible in this case

<u>Solution</u>

<u /> $\frac{5x^{2} +7x+49}{x(x+7)}$

You might be interested in

Applying Properties of Exponents In Exercise,use the properties of exponents to simplify the expression.

vitfil [10]

Answer:

(A) $e^2$

(b) $e^{-3}$

(c) $e^2$

(d) $e^3$

Step-by-step explanation:

We have given expression and we have to simplify the expression using exponent property

(A) $(\frac{1}{e})^{-2}$

So $(\frac{1}{e})^{-2}=\frac{1}{e^{-2}}=e^2$

(b) $(\frac{e^5}{e^2})^{-1}$

So $(\frac{e^5}{e^2})^{-1}=(e^{3})^{-1}=e^{-3}$

(c) $\frac{e^5}{e^3}$

So $\frac{e^5}{e^3}=e^2$

(d) $\frac{1}{e^{-3}}=e^3$

7 0

2 years ago

Light bulbs cost £2.30 each. Yasmin buys as many as she can with £20. How much change should she get? Give your answer in pounds

djyliett [7]

Answer:

£1.6

Step-by-step explanation:

£20 ÷ £2.3= 8 remainder 1.6

change= £1.6

6 0

2 years ago

Read 2 more answers

Need help with 4, thanks!

Veseljchak [2.6K]

Answer:

x=2

Step-by-step explanation:

In order to solve this problem, you need to find the scale factor. This is done through cross multiplying proportions. In this instance, you have to cross multiply x/4 by 3.5/7. When you multiply x and 7, you get 7x. When you multiply 3.5 and 4, you get 14. Simplify by isolating the variable, and you get 2.

7 0

3 years ago

Which inequality represents this graph?

murzikaleks [220]

The answer is y
$y > 4$

3 0

2 years ago

Read 2 more answers

High expression is equivalent to ^4 square root x^10

Talja [164]

In order to find which <u>expression</u> is <u>equivalent</u> to $\sqrt[4]{x^{10}},$ <u>simplify</u> all given expressions:

0.

$\sqrt[4]{x^{10}}=x^{\frac{10}{4}}=x^{\frac{5}{2}}=x^{2.5}.$

1.

$x^2(\sqrt[4]{x^2})=x^2\cdot x^{\frac{2}{4}}=x^2\cdot x^{\frac{1}{2}}=x^2\cdot x^{0.5}=x^{2.5}.$

2.

$x^{2.2}.$

3.

$x^3(\sqrt[4]{x} )=x^3\cdot x^{\frac{1}{4}}=x^3\cdot x^{0.25}=x^{3.25}.$

4.

$x^5.$

Therefore,

Answer: correct choice is A

7 0

3 years ago