variable
solve if r=5
r + 7 - r = ?
r=7
Find the value of 2 to the power of 4.
16
Solve if g=-2
5 + g - 4 = ?
g=-1
Solve if x=1/2
x × 2 + 7 = ?
x=8
Solve for x: 2x + 5 = 11
x = 3
Sarah has n number of books. She buys 4 more. Now she has 15 books. How many books did she have originally? Write the equation and solve.
n=11