I need help againnnn, the 2nd and 3rd pics are supposed to be together

Answer:

umm what do you mean can like you explain

Answer:

Question 15: The length of the 3rd side is a-2 units. (I will answer Question 16 as a comment, by the way)

Step-by-step explanation:

Question 15:

Perimeter is the sum of all the side lengths of a shape, in this case, the shape is a triangle. Two side lengths and the perimeter is given, and you have to find the length of the 3rd side.

First, you'll need to add both of the given side lengths together. You do that by making an equation, where you can say that a question mark represents the unknown side.

2(a+3) + (3a-1)+ ? =6a+3

Then, you will need to use the distributive property for the first side. You have to distribute the 2 to the expression inside the parentheses. You need to multiply 2 by a, and by the 3. So, the expression becomes 2a+6.

Next, we'll work on the second side. We have to open up those parentheses that hold 3a-1 inside them. You can do that by distributing the plus sign in front of the parentheses to the expression inside the parentheses. You are just trying to either change or keep the sign in front of the expressions inside the parentheses.

We distribute the + to the 3a by multiplying, and it stays as 3a because the 3a is already a positive expression. If there is no minus sign in front of the 3a, that means that it is positive, and a positive sign multiplied by a positive number gives you a positive product. Now, we need to distribute the plus sign to the second term in the parentheses. Attention, the second term is a -1, not a positive 1. We can get that by changing 3a-1 to 3a+ -1. It is the same thing, it just looks a bit different. In words, the expression would be 3a plus a negative 1, instead of 3a minus 1. After that, we finally multiply the + by -1, which would be -1. That is because a positive sign multiplied by a negative sign will give you a negative product. Finally, after distributing the plus sign to the terms inside the parentheses, the expression becomes 3a-1. It stayed the same as it was, but it is still important to understand why it was not +1.

Now, it's time to re-write the whole expression.

2a+6+3a-1+?=6a+3

The next step is to combine the like terms on the left side of the equal sign. The terms that include the variable "a" come together, and the numbers (or constants) are combined. We combine by adding or subracting the terms. 2a+3a=5a. 6-1=5. This is why it was so important to open up those parentheses in the beginning and distribute, to not get the signs confused. If you skip that step, your answer could be incorrect. We leave the ? alone because there are no other terms that have a ? in them.

The new equation now looks like this: 5a+5+?=6a+3

Then, you need to simplify this equation by moving all of the terms that have an "a" in them to the same side of the equal sign, and the same thing to the constants (the numbers). We need to separate the terms from the question mark because that's what we're solving for. As we move the terms from the left side to the right, their sign changes to the opposite. So, 5a becomes -5a, and +5 becomes -5.

The new equation looks like this: ?=6a+3-5a-5

The next step is to again, combine the like terms, but on the right side of the equal sign. We leave the ? alone for now. 6a-5a=a. +3-5= -2.

The last step would be to just re-write the equation.

?=a-2          That is your answer. The length of the 3rd side is a-2 units.

Key take-aways of this problem:

- Perimeter is the sum of all of the lengths of all of the sides of a shape.

- It's important to look at the sign in front of the parentheses to know how to distribute it to the expresssion inside.

- To simplify an expression, you need to combine the like terms that are in it. The same variables go together, and the numbers do, too.

- When moving terms in an equation to the other side of the equal sign, the term's sign changes to the opposite.

I’m awarding brainliest

Find the area of each shaded region please help i just need help with C and D

Gavin saved $30,000 in a savings account. He received a 2.5% interest rate and saved for 8 years. How much interest did he earn

Write the prime factorization of 363 using exponents.

please help TvT i dunno how many times ima say this today

Awarding Brainliest on this

TIME REMAINING
01:59:29
What is the value of 3 minus (negative 2)?

A number line going from negative 5 to positive 5.
–5
–1
1
5

my teacher let me retry missed questions sooo?

How much is the orange moon counted for?
How much is the green circle counted for?

pls helppppppppppppppppppp

Find the area of the square pyramid represented by this net.

Peggy has $30 to spend on one book at the bookstore. She has a coupon for 15% off the price of one book. She will be charged 7% tax. What is the price (before she uses the coupon) of the most expensive book that Peggy could buy?

I will mark brainliest if you give an explanation

Here is the same question but a bit bigger

HELP PLz Now!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

can someone help me wth this

Help Me with the second one plz!

Here is a recipe for pineapple soda: For every 5 cups of soda water, mix in 2 cups of pineapple juice. How much soda water would you mix with 20 cups of pineapple juice? *

Plz help!!
its not 82 and 71 combined...... its 8 and then 2/3

8 2/3 - 7 1/8

explanation!!!!!!!

Find the area of the figure. (Sides meet at right angles.)

In Jason's baseball card
collection 62% of his cards are
from the National League. If
Jason has 50 cards, how many
players are from the National
League?

please help I'll give brainliest

Solve the equation:
- 5 = 5x + 7

ignore my handwriting but here’s some math i need for tomorrow

HURRY IM BEING TIMED!!! Explain why ratios and proportions would be important when designing environments and characters?

Need help with these two, please thanks

Expand the following expression.

5.2(23 - 3.62x)
A.
119.6x - 18.824
B.
119.6 - 18.824x
C.
18.824 + 119.6x
D.
28.2 - 8.82x

can some one help me

During a sports competition, students participated in races of various distances. The data is shown in the frequency table. What is the range of lengths of the various races?

Please answer! Give explanation to and follow steps to question. Tysm!!

Please don't answer unless you know the answer. Find x and give reasons.