Why do the symbols at right not constitute an equation

Erica's friend Janine made a cylindrical vase in which the sum of the lateral area and area of one base was about 3000 square centimeters. The vase had a height of 50 centimeters. Find the radius of the vase.

Sam decides to build a square garden. If the area of the garden is 25x2 + 30x + 9 square feet, what is the length of one side of the garden?

420: (14+6) - 2 + (2•3)

The product of the roots of 8x² - 2x = 1 is:

In 2017, the world's population was 7.451 billion people. Tge world growth rate is 1.13% annually, (a) what the projected world's population in 2035? (b) how long will it take for world's population to double?

Jill sold half of her comic books and then bought sixteen more. she now has 36. with how many did she begin? (two step equation)

A blue die and green die are rolled find the probability that the sum is 12

Is pi6 rational or irrational

What is 9:901 in long division

Lane's arm span is 61 inches. If his height is 1⁄4 foot longer than his arm span, how tall is he? feet and inches