Explanation:
Picture 1
This is a rectangle so the way to find the area is a=bl
A=10 x 3
A = 30 square feet
Now the perimeter is
P=2l + 2w
P=2(3) + 2(10)
P=6 + 20
P=26
Picture 2
To find the area if a triangle you multiply the height and the base, but you don’t use the hypotenuses, but then you take your product and divide it by two.
A=hb/2
A=3x4/2
A=12/2
A=6
Now the perimeter
Just add together all the sides
3+5+4
12
Picture 3
This one is a square, so all the sides are the same
The area would also be base time’s length
5x5
25
Now the perimeter, because it’s a square, it can be multiplied by 4
5x4
20
Picture 4
We will start with area, it gives you two measurements for the base, but together they will form the the base. So 10 would be the base. Now multiply it by the height, then divide by 2
12x10/2
120/2
60
Now the perimeter, it shows that the other two sides aside from the base are equal, so you would add 13+13+10 which gives you 36 for the perimeter
Picture 5
The equation given is 80-2x
This shows the number of points on a text, and you fill in x with the number of incorrect questions to get the score
So the first question
This person got two incorrect answers so you would plug in two
F(x) = 80-2(2)
f(x)=80-4
f(x)=76
Question 2
Because you are given the points scored you would plug in the score in f(x) and solve for x
68=80-2x
-12=-2x
6=x
They got 6 incorrect answers
There you go.