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We are told that Belinda has $$7.50$ to spend. In an inequality, we would represent this by saying that the amount she can spend is **less than or equal to** $$7.50.$
$Total spent≤7.50 $
Without any extra topping, the cost of a sundae is $$3.65.$ We can now rewrite the left-hand side of the inequality.
$Toppings+3.65≤7.50 $
If we let $x$ represent the number of extra toppings, the product of $x$ and the price per topping, $$0.85,$ describes the cost of the extra toppings. Let's specify our inequality.
$0.85x+3.65≤7.50 $
By solving the inequality for $x$ we can find how many toppings Belinda can get.
The greatest number of toppings Belinda can buy is $4.52941…$ Since Belinda can't buy a fraction of a topping, we have to round this integer down to the nearest whole number, $4.$

$0.85x+3.65≤7.50$

SubIneq$LHS−3.65≤RHS−3.65$

$0.85x≤3.85$

DivIneq$LHS/0.85≤RHS/0.85$

$t≤0.853.85 $

UseCalcUse a calculator

$t≤4.52941…$