Dakota's energetic Uncle Bob loves roller coasters, and he wants to ride them all! One day, Dakota prints out a list of all the roller coasters in the United States. After reading it with Uncle Bob, they discover he has already ridden $90$ of the coasters. There are still $403$ coasters left to ride. $\newline$ Which equation can you use to find the total number of roller coasters $c$ on Dakota's list? $\newline$ Choices: $\newline$ (A) $\frac{c}{90} = 403$ $\newline$ (B) $c - 90 = 403$ $\newline$ (C) $90c = 403$ $\newline$ (D) $c + 90 = 403$ $\newline$ Solve this equation for $c$ to find the number of roller coasters on Dakota's list. $\newline$ ____ roller coasters $\newline$

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Q. Dakota's energetic Uncle Bob loves roller coasters, and he wants to ride them all! One day, Dakota prints out a list of all the roller coasters in the United States. After reading it with Uncle Bob, they discover he has already ridden

90

of the coasters. There are still

403

coasters left to ride.

\newline

Which equation can you use to find the total number of roller coasters

c

on Dakota's list?

\newline

Choices:

\newline

(A)

\frac{c}{90} = 403

\newline

(B)

c - 90 = 403

\newline

(C)

90c = 403

\newline

(D)

c + 90 = 403

\newline

Solve this equation for

c

to find the number of roller coasters on Dakota's list.

\newline

____ roller coasters

\newline

Addition Equation: To find the total number of roller coasters on Dakota's list, we need to add the number of coasters Uncle Bob has already ridden to the number of coasters left to ride. This gives us the equation $c = \text{number ridden} + \text{number left to ride}$ .
Substitute Given Numbers: Substitute the given numbers into the equation: $c = 90 + 403$ .
Perform Addition: Now, perform the addition: $c = 493$ .