MATHEMATICS
MIDDLE SCHOOL

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:

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:

MIDDLE SCHOOL

What 3 ratios that are equivalent

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:

MIDDLE SCHOOL

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]

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:

MIDDLE SCHOOL

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

$3.49 X .10 = .35

the discount is .35 or 35 cents

final cost

3.49-.35= $3.14

hope this helps

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 ($).

MIDDLE SCHOOL

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?

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

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:

COLLEGE

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

log 9 =

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 ...

HIGH SCHOOL

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

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

HIGH SCHOOL

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.

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.

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:

MIDDLE SCHOOL

What number :Increased by 130% is 69 ?

130% as a decimal is 1.3

Divide 69 by 1.3:

69 /1.3 = 53.076923

Round the answer as needed

MIDDLE SCHOOL

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

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)