7th Grade Math

Front

What is the formula for finding the circumference of a circle?

Back

The circumference (C) of a circle is calculated using the formula C = 2πr, where r is the radius.

Front

What is the equation to find the number of teddy bears (t) a company needs to sell to cover its daily costs?

Back

The equation is 1500 + 8t = 12t.

Front

How do you write an algebraic equation for the situation where Joan has 51 seashells and gives some to Alyssa, leaving her with 45?

Back

The equation is 51 - x = 45, where x is the number of seashells given to Alyssa.

Front

What is the formula for finding the area of a circle?

Back

The area (A) of a circle is calculated using the formula A = πr², where r is the radius.

Front

What does the inequality 10 ≥ x - 3 represent?

Back

It represents that x must be less than or equal to 13.

Front

What is the value of the radius if the circumference of a circle is 43.96 inches?

Back

Using the formula C = 2πr, the radius r can be calculated as r = C/(2π) = 7 inches.

Front

What is the relationship between the diameter and radius of a circle?

Back

The diameter (d) is twice the radius (r), so d = 2r.

Front

What does the term 'variable' mean in algebra?

Back

A variable is a symbol (often a letter) that represents an unknown value.

Front

What is the difference between an equation and an inequality?

Back

An equation states that two expressions are equal, while an inequality shows the relationship between expressions that are not necessarily equal.

Front

How do you solve the equation 3x + 5 = 20?

Back

Subtract 5 from both sides to get 3x = 15, then divide by 3 to find x = 5.