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Kamila [148]
3 years ago
15

Which property was used to write the equation in step 2?

Mathematics
2 answers:
Fed [463]3 years ago
8 0
In pretty sure the answer is a
adelina 88 [10]3 years ago
6 0

Answer:

A

Step-by-step explanation:

Given

5(x - 7) = 55, then using the distributive property, that is

a(b - c) = ab - ac, then

5x - 35 = 55

You might be interested in
A lab technician needs 60mL of 25% acid solution for a certain experiment , but he has only 10% solution and 40% solution. How m
V125BC [204]

Answer:

  • 10%: 30 mL
  • 40%: 30 mL

Step-by-step explanation:

The needed concentration is exactly halfway between the available concentrations, hence they must be mixed equally.

He should mix 30 mL each of the 10% and 40% solutions.

_____

The first step in solving any problem is to look at the given information, and at what is being asked for. Here, the mix that is being asked for is exactly halfway between the given concentrations, so you know without any further contemplation that the mix will be 50%/50% of each.

__

If the mix were something else, there are several ways the problem can be solved. I like to use a diagram that puts the available concentrations on the left in a column with the highest on top, the needed concentration in the next column in the middle, and the differences of these numbers on the diagonals in the right column.

<u>Example</u>: if the needed mix is 15%, the diagram would look like ...

   40            5

          15

   10           25

The numbers on the right tell you the proportions required (5:25 = 1:5). For this example, you need 1 part 40% solution and 5 parts 10% solution to make a mix that is 15%. That's a total of 6 parts, so each "part" is 10 mL for 60 mL of solution.

We chose this example so every number in the diagram is different, so you could see how the instructions for use apply.

__

Another way to solve this is to let a variable represent the amount needed of <em>the highest concentration</em>. If we let that variable be x, for the given problem, we can write the equation for the amount of acid in the mix as ...

  40%(x) + 10%(60 -x) = 25%(60)

  0.30x = 9 . . . . . . . . subtract 6, simplify

  x = 9/0.30 = 30 . . . . . mL of 40% solution

6 0
3 years ago
Use the discriminant to describe the roots of each equation. Then select the best description. 3x2 - 2 + 7x = 0
forsale [732]
Hello :
the the discriminant : 3x² + 7x - 2 = 0 is : (7)²-4(3)(-2) =49+24=73
two real roots
3 0
3 years ago
Can I have workings out plz x
mixer [17]

Answer:

pretty sure the answer is 432 cm2 not sure im in a rush

Step-by-step explanation:

8 0
3 years ago
If y = 0.15 when x = 1.5, what is y when x = 6.3?
Juliette [100K]
(6,3x0,15)/1,5 = 0,945/1,5 = 0,63

<span>I hope to have helped you ! :)</span>

7 0
3 years ago
Read 2 more answers
riel wants to use squares to tile a floor that measures 240 cm by 300 cm what is the length of the largest square he can use
Alexxx [7]
<span>So, what you want is the biggest square that can evenly tile a space 240*300. The biggest possible number that can divide 240 and 300. Does that ring any bells? Maybe you should divide 240 and 300</span>
4 0
3 years ago
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