1. ms. howard buys a car for $500 and adds a music system that costs $200. then she adds a pair of seat…

1. ms. howard buys a car for $500 and adds a music system that costs $200. then she adds a pair of seat covers for the price shown. how much has ms. howard spent on the car so far?\n2. at the beginning of the week, tideland manufacturing had an inventory of 60,000 screws. this week they received a shipment of 30,000 more screws. then they used 50,000 screws to make their tideland mowers. how many screws do they have left in inventory?\n3. stem a chemical reaction is endothermic if it absorbs heat from its surroundings. it is exothermic if it gives off heat to its surroundings. in her chemistry class, lily is given a salt (ammonium nitrate) and a beaker of water at 60 °f. she dissolves the salt in the water and sees that the temperature of the solution is now 50 °f. did the temperature of the solution increase or decrease? by how many degrees? what kind of reaction has occurred? explain.\n4. at the beginning of the month, joe has $180 in his bank account. he wants to buy a new gaming system for $250 in two weeks. his parents have offered to loan him money if he needs it. he gets $20 a week for an allowance. will he have enough money at the end of two weeks to make the purchase on his own? if not, how much will he have to borrow from his parents? explain.\n5. reason can you ever add two positive integers and get a negative integer? explain.\n6. reason can you subtract a positive integer from a positive integer and get a negative result? explain your answer.

1. ms. howard buys a car for $500 and adds a music system that costs $200. then she adds a pair of seat covers for the price shown. how much has ms. howard spent on the car so far?\n2. at the beginning of the week, tideland manufacturing had an inventory of 60,000 screws. this week they received a shipment of 30,000 more screws. then they used 50,000 screws to make their tideland mowers. how many screws do they have left in inventory?\n3. stem a chemical reaction is endothermic if it absorbs heat from its surroundings. it is exothermic if it gives off heat to its surroundings. in her chemistry class, lily is given a salt (ammonium nitrate) and a beaker of water at 60 °f. she dissolves the salt in the water and sees that the temperature of the solution is now 50 °f. did the temperature of the solution increase or decrease? by how many degrees? what kind of reaction has occurred? explain.\n4. at the beginning of the month, joe has $180 in his bank account. he wants to buy a new gaming system for $250 in two weeks. his parents have offered to loan him money if he needs it. he gets $20 a week for an allowance. will he have enough money at the end of two weeks to make the purchase on his own? if not, how much will he have to borrow from his parents? explain.\n5. reason can you ever add two positive integers and get a negative integer? explain.\n6. reason can you subtract a positive integer from a positive integer and get a negative result? explain your answer.

Answer

1.

Explanation:

Step1: Identify costs

The cost of the car is $500, music - system cost is $200, and seat - covers cost is $75.

Step2: Calculate total cost

$500 + 200+75=775$

Answer:

$775$

2.

Explanation:

Step1: Calculate total screws received

Initial inventory is 60000 and received 30000 more, so total screws available is $60000 + 30000=90000$.

Step2: Calculate remaining screws

They used 50000 screws. So remaining screws are $90000 - 50000 = 40000$.

Answer:

$40000$

3.

Explanation:

Step1: Determine temperature change

Initial temperature of water is $60^{\circ}F$ and final temperature of solution is $50^{\circ}F$. The change is $60 - 50=10^{\circ}F$.

Step2: Identify reaction type

Since the temperature of the solution decreased, the reaction absorbed heat from the surroundings. So it is an endothermic reaction.

Answer:

The temperature decreased by $10^{\circ}F$. It is an endothermic reaction.

4.

Explanation:

Step1: Calculate total money after two - weeks

Joe starts with $180 and gets $20 per week for 2 weeks. So total money is $180+20\times2=180 + 40 = 220$.

Step2: Compare with cost of gaming system

The gaming system costs $250$. Since $220<250$, he doesn't have enough money.

Step3: Calculate amount to borrow

He needs to borrow $250 - 220=30$.

Answer:

No, he doesn't have enough money. He has to borrow $30$ from his parents.

5.

Brief Explanations:

Positive integers are greater than 0. When we add two positive numbers, we are moving further to the right on the number line (in the positive direction). So the sum of two positive integers is always positive.

Answer:

No, you cannot add two positive integers and get a negative integer.

6.

Brief Explanations:

If the positive integer being subtracted is greater than the positive integer from which it is being subtracted, the result will be negative. For example, if we have $5-8$, we start at 5 on the number - line and move 8 units to the left, resulting in $- 3$.

Answer:

Yes, you can subtract a positive integer from a positive integer and get a negative result if the number being subtracted is larger than the number from which it is being subtracted.