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3 years ago

Can someone please help me with this?

Mathematics

1 answer:

grin007 [14]3 years ago

3 0

Answer:

C) 78%

Step-by-step explanation:

You can use process of elimination for this one. So first, obviously it wont be lower than the last test score which is at 65%, so you can mark off A and B. Then, if you notice the test scores fall right next to the big blue line, so find 9 hours, and then look all the way up to where it touches the line and you can see it is about a little less than 80%, which can mean that it obviously ain't D, so it is therefore C. I hope this helps :)

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One bricklayer can build a wall in 6 hours. Another bricklayer could build the same wall in 4 hours. If they work together, how

Natasha2012 [34]

Answer:

they work together, it will take 2.4 hours to build the wall.

Step-by-step explanation:

One bricklayer can build a wall in 6 hours.

One hour work = $\frac{1}{6}$

Another bricklayer can build the same wall in 4 hours.

One hour work = $\frac{1}{4}$

They can together, how long will take them to build the wall.

Let's take "t" the time taken to build the wall.

The sum of their work rate = 1 (To build the wall)

$\frac{t}{6} + \frac{t}{4} = 1$

Now we have to solve this equation. Take LCD of 6 and 4.

The LCD (least common divisor) of 6 and 4 is 12.

$\frac{2t + 3t}{12} = 1$

5t = 12*1

5t = 12

Dividing both sides by 5, we get

t = $\frac{12}{5}$

t = 2.4 hours.

So, they work together, it will take 2.4 hours to build the wall.

6 0

4 years ago

2x + 5y = 6

Snezhnost [94]

Step-by-step explanation:

Given equations

2x + 5y = 6 .......i)

2x = 10 - 3y...... II)

Putting 2x = 10 - 3y in equation i

10 - 3y + 5y = 6

2y = 6 - 10

2y = - 4

y = - 4 / 2

y = - 2

Now putting y = - 2 in equation ii

2x = 10 - 3 * ( - 2)

2x = 10 + 6

2x = 16

x = 16 / 2

x = 8

So x = 8 and y = - 2

Hope it will help :)❤

7 0

3 years ago

Plz help will be marked brillent 5 stars and thanks !!!!

Pavel [41]

The answer is 25!
3 times 7 = 21 + 4 = 25

6 0

3 years ago

Read 2 more answers

- 60= - 24 + 12r<br> How do I solve this problem and what are the steps to solve the problem

Paul [167]

Answer:

r = -3

Step-by-step explanation:

- 60= - 24 + 12r

Add 24 to each side

- 60+24= - 24+24 + 12r

-36 = 12r

Divide each side by 12

-36/12 = 12r/12

-3 =r

8 0

3 years ago

A house painting company charges $376 plus $12 per hour. Another painting company charges $280 plus $15 per hour. a. How many ho

notka56 [123]

M: cost per hour
b: initial charge fee
x: hours (h)
To make both company to charge the same amount:
12x+376=15x+280
376-280=15x-12x
96=3x
X=32
So it took 32 hour to 2 company charge the same amount.
The cost gonna be: 12.(32)+376=760$

3 0

3 years ago