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4 years ago

What does X equal. HELP PLEASE!!

Mathematics

1 answer:

Anton [14]4 years ago

4 0

Answer:

x=3

Step-by-step explanation:

8x-28-2x=-10

We move all terms to the left:

8x-28-2x-(-10)=0

We add all the numbers together, and all the variables

6x-18=0

We move all terms containing x to the left, all other terms to the right

6x=18

x=18/6

x=3

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Mary mixes white paint and blue paint in the ratio 2:3

Sedbober [7]

Given:

Ratio of white and blue paint is 2:3

Total quantity of paint is 20 litres

To find:

Quantity of blue paint to be mixed so that the ratio of white paint to blue paint becomes 1:7

Solution:

The ratio 2:3 totals 20 that is $2x+3x=20\rightarrow5x=20\rightarrow x=4$

So, the quantity of white paint in the mixture is $2\times4=8$ and the quantity of blue paint in the mixture is $3\times4=12$

Now, to get the final ratio as 1:7, Mary should have $7\times8=56 \text{ litres }$ of blue paint. So, she need to add $56-12=44 \text{ litres}$ .

Therefore, Mary has to add 44 litres of blue paint to the mixture to make the ratio as 1:7.

3 0

3 years ago

What is the difference between the ratio : and the ratio of : ?

Tanya [424]

Answer:

its same

Step-by-step explanation:

there is no difference b/w these two

8 0

3 years ago

Please help me this is due today How many students do not prefer pepperoni pizza ??

Rina8888 [55]

Answer:

50%

Step-by-step explanation:

how ever many kids are in that class, divide it by 2 and that will be the amount of kids that do not prefer pepperoni (:

3 0

4 years ago

Bob won a $200,000 lottery. He invests part of the money in real estate with an annual return of 3% and the rest in a money mark

SVETLANKA909090 [29]

Answer:

Bob invested $50,000 in real state and $150,000 in a money market.

Step-by-step explanation:

Assuming that x is the investment in real state:

(200,000-x)*0.045 + x * 0.03 = 8,250

Apply distributive property:

(200,000*0,045) - 0.045x +0.03x = 8,250

9,000 - 0.045x +0.03x = 8,250

We must clear x:

- 0.045x +0.03x = 8,250 - 9,000

-0.015x = -750

x = -750/-0.015

x = 50,000

So, the invest in real state is $50,000.

$200,000 - $50,000 = $150,000 is the invest in a money market.

4 0

3 years ago

The vertices of ∆PQR are P(–2, –4), Q(2, –5), and R(–1, –8). If you reflect ∆PQR across the y-axis, what will be the coordinates

yawa3891 [41]

A reflection around the axis and is given by the following rule:
(x, y) ----> (-x, y)
Applying the rule to each vertex we have:
(-2, -4) ----> (2, -4)
(2, -5) ----> (-2, -5)
(-1, -8) ----> (1, -8)
Answer:
the coordinates of the vertices of the image ΔP'Q'R 'will be:
P '= (2, -4)
Q '= (- 2, -5)
R '= (1, -8)

3 0

3 years ago