Shown here mathematical step. Identify the mathematical reason or property used to simplify from the first step to the second step.

7 (A+13)

7A+91

One divide by four why pluse four equals one divide by six why

7 A triangle is right-angled if the sides are a = m2 - n2, b = 2mn and c = m2 + n2 where m and n are positive integers, and m > n. Show that this is true by substituting into the equation c2 = a2 + b2.

Simplify 4x - 2y - 3x + 5y

Imagine that you have a bag containing 10 marbles of different colors. you have drawn a marble, recorded its color, and replaced it fifty times, with the following results: 9 purple, 16 orange, 6 yellow, and 19 green marbles.

A hexagonal tray of vegetables has an area of 450 cm^2. What is the length of each side of the hexagon?

Priscilla has an income of $122,300.00 $122,300.00 and is married filing jointly. Married Filing Jointly If Taxable Income Is between: Then the Tax Due Is: $0.00 - $19,400.00 $0.00 - $19,400.00 10% 10% of taxable income $19,401.00 - $78,950.

The members of the Student Activity Council on your campus are meeting to select two speakers for a month-long event celebrating artists and entertainers. The first names of the choices are Ben, Will, Stewart, Hilary, and Kate.

A circle has a circumference of 120cm calculate the radius of the circle?

A dealer paid 10000 for a boat at an auction. At the dealership, a salesperson sold the boat for 30% more than the auction price. The salesperson received a commission of 25% of the difference between the auction price and the dealership price.

Bill reads 1/5 of a book on Monday he reads 2/3 of a book on Tuesday if he finish reading the book on Wednesday what fraction of the book did he read on Wednesday