General SAT Math

Question 1

What is the explicit formula for an arithmetic sequence?

Answer 1

a(n) = a₁ + (n – 1)d

n= the number you're looking for in the sequence
d= common difference

The a(n) is supposed to have n as a subscript but I can’t get it to work here! Sorry! Don’t multiply them!

Question 2

How do you make a fraction using a ratio?

Answer 2

Add both parts of the ratio to find the denominator. The numerator is the part of the ratio you need to use. E.g. 2::7 is 2/9 and 7/9, respectively.

Question 3

What is the domain?

Answer 3

All included x-values.

Question 4

What is the range?

Answer 4

All included y-values.

Question 5

What’s the order of operations?

Answer 5

PEMDAS

Parentheses
Exponents
Multiplication/Division (as they occur left to right)
Arithmetic/Subtraction (as they occur left to right)

Question 6

Where are the solutions of a parabola?

Answer 6

Where it touches the x-axis. Also called zeros and roots.

Question 7

`What is the explicit formula for an arithmetic sequence?

Answer 7

a(n) = a₁ + (n – 1)d

n= the number you're looking for in the sequence
d= common difference

The a(n) is supposed to have n as a subscript but I can’t get it to work here! Sorry! Don’t multiply them!