beginning algebra word problems inequalities

[jonesbetty]

a certain kind of animal weighs about 77 pounds at birth and gains about 2 pounds per day for the first few weeks. determine those days for which the animal's weight is more than 129 pounds

 

[Deleted member 4993]

a certain kind of animal weighs about 77 pounds at birth and gains about 2 pounds per day for the first few weeks. determine those days for which the animal's weight is more than 129 pounds

Start these problems by "naming" variables - to be found. In this problem - that would be

the days for which the weight is more than 19.

Then, let:

the days = D

Now continue......

Please share your work with us, indicating exactly where you are stuck - so that we may know whereto begin to help you.

 

[jonesbetty]

word problems

I have a problem breaking down a word problem so i can find the answer. i know i have to name the variables but what then

 

[soroban]

Hello, jonesbetty!

A certain kind of animal weighs about 77 pounds at birth
and gains about 2 pounds per day for the first few weeks.
Determine those days for which the animal's weight is more than 129 pounds.

Since this is "beginning algebra", I assume she hasn't heard of Arithmetic Series yet.


Look at the animal's weight over the first few days.

. . \(\displaystyle \begin{array}{cc}\text{Day} & \text{Weight} \\ \hline 0 & 77 \\ 1 & 79 \\ 2 & 81 \\ 3 & 83 \\ \vdots & \vdots \\ x & ? \end{array}\)


Can you express the weight on the \(\displaystyle x^{th}\) day?

The pattern seems to be: .77 + twice the number of days.

. . That is: .\(\displaystyle W \:=\:77 + 2x\)


The question is:. when is. \(\displaystyle W > 129\) ?

. . Solve the inequality: .\(\displaystyle 77 + 2x \:>\:129\)