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Ronch [10]
2 years ago
6

three-quarters of a pile of bricks were used for a certain project. when two thirds of the reminder had been used, 50 bricks wer

e left. how many bricks were there in the original pile?​
Mathematics
1 answer:
lara31 [8.8K]2 years ago
4 0

Answer:

200 Bricks

Step-by-step explanation:

1/3 of the bricks were not used(which was 50 bricks), meaning that 3/3 is 150 bricks of the pile. Since 150 is 3/4 of the original pile, that means that there was 200 bricks at the beginning.

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Distribute. 5(b - 1)
pshichka [43]

Answer:

5b-5

Step-by-step explanation:

5(b - 1)

5(b) 5(-1)

5b-5

4 0
3 years ago
What number is 40% of 720
pentagon [3]

Answer:

288

Step-by-step explanation:

Hope it helps :>

8 0
3 years ago
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A = √7 + √c and b = √63 + √d where c and d are positive integers.
mrs_skeptik [129]

Answer:

\displaystyle a:b=\frac{1}{3}

Step-by-step explanation:

<u>Ratios </u>

We are given the following relations:

a=\sqrt{7}+\sqrt{c}\qquad \qquad[1]

b=\sqrt{63}+\sqrt{d}\qquad \qquad[2]

\displaystyle \frac{c}{d}=\frac{1}{9} \qquad \qquad [3]

From [3]:

9c=d

Replacing into [2]:

b=\sqrt{63}+\sqrt{9c}

We can express 63=9*7:

b=\sqrt{9*7}+\sqrt{9c}

Taking the square root of 9:

b=3\sqrt{7}+3\sqrt{c}

Factoring:

b=3(\sqrt{7}+\sqrt{c})

Find the ration a:b:

\displaystyle a:b=\frac{\sqrt{7}+\sqrt{c}}{3(\sqrt{7}+\sqrt{c})}

Simplifying:

\boxed{a:b=\frac{1}{3}}

3 0
3 years ago
What is the equation of the axis of symmetry for the parabola y= 1/4(x+2)^2-7
Nezavi [6.7K]
Your answer is -2 as the axis of symmetry is at -b/2a. So if you were to expand the equation, you would get y= x^2/4 +x -6 where b is 1 and 2a is ½ . Therefore -1 / ½ gives you -2
7 0
4 years ago
Sam is practicing long track speed skating at an ice skating rink The distance around the rink and 250 yards has skated around t
Vladimir [108]
There are 1760 yards in one mile and the rink is 250 yard in perimeter.

This means 3 miles is 5280 yards. 
 
If Sam has already gone around the whole rink 6 times, that means he was traveled a total of 1500 yards.  

Sam has 3780 more yards to travel 3 miles.

This means he needs to do 15.12 more laps around the rink.  Or 16 if you are rounding.

Hope this helps! :)
3 0
3 years ago
Read 2 more answers
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