Question

a kitten is born having a mass of 90 grams and gains 10 grams per day.
how many days, $x$, will it take the kitten to double its mass? write and solve the equation.
enter the correct answers in the boxes.
equation: $square$
$square$ days

Explanation:

Step1: Define target mass

Double the initial mass: $90 \times 2 = 180$ grams

Step2: Set up mass gain equation

Let $x$ = days. Mass after $x$ days: $90 + 10x = 180$

Step3: Isolate the variable term

Subtract 90 from both sides: $10x = 180 - 90$
$10x = 90$

Step4: Solve for $x$

Divide by 10: $x = \frac{90}{10}$

Answer:

equation: $90 + 10x = 180$
9 days