Is there a picture? I don't know how to answer without the actual problem. Sorry,
Answer:
In mathematics, the slope or gradient of a line is a number that describes both the direction and the steepness of the line
Step-by-step explanation:
Rectangle formular is
Length * width
That means 15.9 * 9.1 =144.69
Answer:
To find the volume of this figure, we must find the base area(pentagon) and multiply it by the figure's height.
Formula for area of a pentagon:-
A = 1/2 x p x a
Where 'p' represents the perimeter, and 'a' represents the apothem.
First, let's figure out the perimeter of the base pentagon.
One side of this pentagon is 10cm, and there are 5 side lengths of 10cm to this pentagon. So it'll result in (5 x 10) = <u>50cm</u> altogether.
The apothem is given, <u>6.9cm</u>.
So, we plug these into our formula:-
A = 1/2 x p x a
A = 1/2 x 50 x 6.9
A = 50/2 x 6.9
A = 25 x 6.9
A = <u>172.5cm</u>, is the area of the pentagon.
Now we find the height of this figure and multiply it by the base area we've found(pentagon).
Our height is 17cm.
172.5(17)
= <u>2,932.5 cubic centimetres</u>, is our volume.
The error that Barbara's made is that Barbara wrote (d+63) instead of (d+9).
<h3>What is Distributive property?</h3>
The distributive property of multiplication is that when two numbers are added such as (a+b) and multiplied by a third number such as x, then the result will be the sum of multiplication of the third number with the first number (xa) and the third number with the second number (xb).
x(a+b) = xa + xb,
The expression which is equal to the expression 7d+63 can be written as,
Hence, the error that Barbara's made is that Barbara wrote (d+63) instead of (d+9).
Learn more about Distributive property:
brainly.com/question/13130806
