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n200080 [17]
2 years ago
14

SOMEONE PLEASE JUST ANSWER THIS FOR BRAINLIEST!!!

Mathematics
2 answers:
lapo4ka [179]2 years ago
7 0

Answer:

-4a^2 -7a^2 - 2ab +3ab +9b^2 -5b^2

11a^2 + ab +4b^2

Step-by-step explanation:

LekaFEV [45]2 years ago
4 0

Answer:

-11a^2+ab+4ab^2

Step-by-step explanation:

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What combination of transformations is shown below?
melamori03 [73]

Answer:

Rotated then translated

Step-by-step explanation:

4 0
3 years ago
Anyone can help me solve this equation using cross multiplying
Natali5045456 [20]

9514 1404 393

Answer:

  x = 1 or 5

Step-by-step explanation:

The notion of "cross-multiplying" is the idea that the numerator on the left is multiplied by the denominator on the right, and the numerator on the right is multiplied by the denominator on the left. This looks like ...

  \displaystyle \frac{x-1}{7}=\frac{2x-2}{3x-1}\ \longrightarrow\ (x-1)(3x-1)=(7)(2x-2)

Then the solution proceeds by eliminating parentheses, and solving the resulting quadratic equation.

  3x^2-4x+1=14x-14\\\\3x^2-18x+15=0\qquad\text{subtract $14x-14$}\\\\x^2-6x+5=0 \qquad\text{divide by 3}\\\\(x-1)(x-5)=0\qquad\text{factor}\\\\x\in\{1,5\}

_____

<em>Comment on "cross multiply"</em>

Like a lot of instructions in Algebra courses, the idea of "cross multiply" describes <em>what the result looks like</em>. It doesn't adequately describe how you get there. The <em>one and only rule</em> in solving Algebra problems is "<em>whatever is done to one side of the equation must also be done to the other side of the equation</em>." If you multiply one side by one thing and the other side by a different thing, you are violating this rule.

What looks like "cross multiply" is really "<em>multiply by the product of the denominators</em> and cancel like terms from numerator and denominator." Here's what that looks like with the intermediate steps added.

  \displaystyle \frac{x-1}{7}=\frac{2x-2}{3x-1}\\\\\frac{x-1}{7}\times7(3x-1)=\frac{2x-2}{3x-1}\times7(3x-1)\\\\(x-1)(3x-1)=(2x-2)(7)\qquad\textit{looks like}\text{ cross multiply}

8 0
2 years ago
How do you turn 13/25 (fraction) into a decimal?
Karo-lina-s [1.5K]


13/25

first off, to turn a fraction into a decimal, you divide numerator by denominator

in this case, 13/25=.52

answer is .52

4 0
3 years ago
Read 2 more answers
What is 70% of 45?????????
borishaifa [10]

Answer:

31.5

Step-by-step explanation:

4 0
3 years ago
An automated teller machine at a local bank is stocked with $10 and $20 bills. When a customer withdraws $40 from the machine, i
cestrela7 [59]

Answer:

There are 4 possibilities

Step-by-step explanation

Each customer has 2 ways to receive the money. For each way, the other customer has 2 option, giving a total of 2*2 = 4. Here are the possibilities, separating in 2 different cases.

Case 1: customer 1 withdraws 2 $20 bills

option 1.1: customer 1 withdraws 2 $20 bills AND customer 2 withdraws 2 $20 bills

option 1.2: customer 1 withdraws 2 $20 bills AND customer 2 withdraws 4 $10 bills

Case 2: customer 1 withdraws 4 $10 bills

option 2.1:  customer 1 withdraws 4 $10 bills AND customer 2 withdraws 2 $20 bills

option 2.2: customer 1 withdraws 4 $10 bills AND customer 2 withdraws 4 $10 bills

options 1.1, 1.2, 2.1 and 2.2 give us a total of four ways for the customers to retrieve thier money.

5 0
3 years ago
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