# Olga simplifies the expression x + 7x to 7x2. Use the drop-down menus to complete the statements below to explain why Olga's solution is correct or incorrect.

## Answers

Answer 1
Answer:

Answer: Olga's solution is incorrect

x + 7x is the same as 1x + 7x

7x2 is the same as 7x. x

x + 7 x simplifies to 8x

Step-by-step explanation:

Answer 2
Answer:

Answer:

Olga's solution is incorrect. x + 7x is the same as 1x+7x. 7x2 is the same as7x × x . x + 7x simplifies to 8x.

Step-by-step explanation:

## Related Questions

What 3 ratios that are equivalent

### Answers

Answer:

1:2, 2:4, 3:6

Step-by-step explanation:

If you times 1:2 by 2, you get 2:4. If you times 1:2 by 3, you get 3:6.

You have to multiply each individual number in the ratio.

Answer:1:3

2:6

4:12

Step-by-step explanation:

A rectangular packet of drink has a width that is 2 cm less than its length. Its height is 4 cm more than its length.
(a) It is given that the length of the packet is m cm. Write down an expression,
in terins of m, for the total surface area of the packet.
[2]​

### Answers

Answer:

Step-by-step explanation:

Given that the length of the packet is cm.

Then the width being 2cm less than the length becomes and the height being 4 cm more than its length becomes

The total surface area of the rectangular packet is given by:

We expand to get:

A loaf of bread originally priced at \$3.49 has been discounted 10%.

### Answers

\$3.49 X .10 =  .35

the discount is .35 or 35 cents
final cost
3.49-.35= \$3.14

hope this helps
Take 3.49 and multiply by.1 (3.49 x .1) then you subtract the answer from 3.49 (3.49 - answer = discounted price) it'll come out as a whole number and the decimal in the thousandths place (ex: 0.001). just round to the nearest hundredth (ex: 0.01). don't forget to add the dollar sign (\$).

The average weight of 22 girls in a class is 58kg and the average weight of 28 boys in the same class is 60kg. What is the average weight of all the 50 students in that class?

### Answers

Total girls' weight: 1276
Total boys' weight: 1680
Boys + Girls = 2956

2956/50 total = 59.12

The average weight of all 50 students is 59.12

Answer:

Total girls' weight: 1276

Total boys' weight: 1680

Boys + Girls = 2956

2956/50 total = 59.12

The average weight of all 50 students is 59.12

Step-by-step explanation:

Rewrite as a quotient of two base- 5 logarithms. Write your answer in simplest form.
log 9 =

### Answers

In my opinion, that is the simplest form. However, your teacher may want you to remove powers and factors of 5. In that case, the result is ...

Classify -2x^4-x^3+8x^2=12 by degree

### Answers

To find the degree of a polynomial, we must find the LARGET power in the equation: and that is 4.

Which statements are true of all squares? Check all that apply. (Choose more than one) [] The diagonals are perpendicular.
[] The diagonals are congruent to each other.
[] The diagonals bisect the vertex angles.
[] The diagonals are congruent to the sides of the square.
[] The diagonals bisect each other.

### Answers

The statements that are true of all squares are:

The diagonals are perpendicular.
The diagonals are congruent to each other.
The diagonals bisect the vertex angles.
The diagonals bisect each other.

However, the diagonals of a square are not congruent to the sides of the square.

Answer:

the answers are A,B,C, and E

Step-by-step explanation:

What number :Increased by 130% is 69 ?

### Answers

130% as a decimal is 1.3

Divide 69 by 1.3:

69 /1.3 = 53.076923

Round the answer as needed

61 random samples of city rent prices are selected from a normally distributed population the samples have a mean of \$738 and a standard deviation of \$41 construct a 95% confidence interval for the population standard deviation

### Answers

Answer:

(728, 748)

Step-by-step explanation:

You need the Z value which for 95% confidence interval is 1.96. The mean is \$738 and the standard deviation of \$41.

Therefore we can calculated the confidence interval

The interval is (728,748)