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svetoff [14.1K]
3 years ago
9

-3a+6b=a+4b I need to solve this please.

Mathematics
1 answer:
exis [7]3 years ago
6 0

Answer:

a*2=b

Or

a=0, b=0

Step-by-step explanation:

if a=0 and b=0, then 0=0, it'd be correct, but I'm sure that's not the answer they intend you to pick. You should still put that as one of the answers, however.

-3a+6b=a+4b

+3a     +3a

6b=4a+4b

-6b     -6b

0=4a-2b

/2 /2  /2

0=2a-b

so, we now know that b is twice the amount that a is, and actually, that's the solution for the entire thing.

So, the answer is a*2=b, because the equation works for any set of numbers, as long as it follows this rule.

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The perimeter of a rectangle is 44 centimeters. If the length is 10 centimeters, find the value.
lukranit [14]

Answer:

12 cm is the width

Step-by-step explanation:

The perimeter of a rectangle is given by

P = 2(l+w)

We know the perimeter is 44 and the length is 10

44 = 2 (10+w)

Divide each side by 2

44/2 = 2/2 (10+w)

22 = 10+w

Subtract 10 from each side

22-10 = 10-10 +w

12 = w

The width is 12

7 0
4 years ago
Read 2 more answers
Solve<br> 13^x+2=5<br> having a bit of trouble
-Dominant- [34]
<em>Solve: </em>13^{x} + 2 = 5

Start by isolating the x-variable as much as you can:
13^{x} = 5 - 2 = 3
13^{x} = 3

Now, if we take the log with base 13 of both sides, then the left hand side will cancel out really easily. This is based on the concept of inverse operations. For example, when we take the square of a square root, we get our initial value. This is because the two operations are inverses of each other, and basically undoes each other.

Logarithms and exponentials are the inverse operations of each other. If we want to extrapolate the power of an exponential, we take the logarithmic function of it, and vice versa.

In this case, we are saying what power of '13' will produce us with 13ˣ, and the only answer will be x itself.

log_{13}(13^{x}) = log_{13}(3)
x = log_{13}(3)
3 0
4 years ago
Suppose an investment of $8,200 doubles in value every 7 years. How much is the investment worth after 28 years?
lutik1710 [3]
$229,600 is how much money you would have in 28 years.
6 0
4 years ago
Read 2 more answers
2) Key components of financial planning include all of the following except:
nexus9112 [7]

Answer:

b

Step-by-step explanation:

i took the test pls mark me the brainliast

5 0
3 years ago
In ΔPQR, r = 870 cm, p = 410 cm and ∠Q=142°. Find ∠R, to the nearest degree.
lutik1710 [3]

Answer: 26

Step-by-step explanation:

8 0
3 years ago
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