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4 years ago

In a sale 10% for all items. a chair cost £63. how much was before sale?

Mathematics

1 answer:

ELEN [110]4 years ago

5 0

I think that it was 70 before

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Can someone help me with (2/3 +1/4) • 5/6

strojnjashka [21]

Answer:

35/6

Step-by-step explanation:

add the fractions in parentheses by finding the common denominaters and adding. then multiply your answer by 5/6. :)

4 0

4 years ago

Read 2 more answers

ANSWER ASAPPPPPPPPPP////

Mamont248 [21]

3x^2 - 2x^2y + 2xy^2 + 4y^2 + xy^2 - y^2 + 2x^2y
= 3x^2 + 3y^2 + 3xy^2

answer
3x^2
3y^2
3xy^2

6 0

3 years ago

In Psychology 101, the ratio of the number of girls to the number of boys is $3:1$. After one girl drops the class and three mor

iVinArrow [24]

Answer:

There are 68 students in the class after these changes.

Step-by-step explanation:

g = number of girls

b = number of boys

Because the ratio of girls to boys is 3:1, initally the equation was

g = 3b

Finally, we have

g-1 girls because one girl dropped the class

b+3 boys because three more boys signed up

Because the new ratio of girls to boys is 5:2, the new equation is

(g - 1)/(b + 3) = 5/2

Cross multiply.

2(g - 1) = 5(b + 3)

2g - 2 = 5b + 15

2g - 5b = 17

Then, substitute g (which is 3b because the first equation was g = 3b)

2(3b) - 5b = 17

b = 17

g = 3b = 3*17 = 51

g = 51

The final number of students in the class = 17 + 51 = 68

Answer: 68

7 0

3 years ago

I need to know the answer to 6 and 7

RSB [31]

6. least and/or lowest (unsure)
7. lowest

7 0

3 years ago

Despite tuition skyrocketing, a college education is still valuable. Recent calculation by the federal reserve bank in San Franc

insens350 [35]

Answer:

The variance is: $169,367,949

Step-by-step explanation:

Given

Tuition: $40,632, $35,554, $42,192, $33,432, $69,479, and $43,598

Required

Determine the variance

First, calculate the mean

$\bar x = \frac{\sum x}{n}$

Where

$n =6$

$\bar x = \frac{40,632+35,554+42,192+33,432+69,479+43,598}{6}$

$\bar x = \frac{264,887}{6}$

$\bar x = 44147.8333333$

$\bar x = 44148$ --- approximated

The sample variance (s^2) is calculated using:

$s^2 = \frac{\sum(x - \bar x)^2}{n-1}$

This gives:

$s^2 = \frac{(40,632-44148)^2+(35,554-44148)^2+(42,192-44148)^2+(33,432-44148)^2+(69,479-44148)^2+(43,598-44148)^2}{6-1}$

$s^2 = \frac{846839745}{5}$

$s^2 = 169367949$

<em>The variance is: $169,367,949</em>

3 0

3 years ago