how do you solve the equation - 8-3+8 + (-3) and other questions of this structure, I got this from Kahn Academy: 7th grade math, adding and subtracting negative numbers

Marty buys a bicycle for$350 reduced from $402,50 what is her percentage saving

9-3 (1/3) 4 (7-8) + 15

3. Dina started chores at 8:15 A. M. And finished at 9:05 A. M. It took her 30 minutes to clean her room and she spent the rest of the time bathing her dog. How long did Dina spend bathing her dog?

Your answer is incorrect. Length: Your answer is incorrect. Width: Your answer is incorrect. The area of a rectangle is 65 ft2, and the length of the rectangle is 3 ft less than double the width. Find the dimensions of the rectangle.

A printing press can print 224 newspapers in 8 minutes. What is the unit rate

75% of the students who bought lunch yesterday ate chicken patties. If 120 students ate chicken patties, what was the total number of students who bought lunch?

Which of the following is a geometric series? A. 40 + 50 + 60 + 70 B. 40 + 42 + 44 + 46 C. 40 + 80 + 40 + 120 D. 40 + 20 + 10 + 5

A tent company has a tent design that is a triangular prism. The following is a net of the design. if a = 82 inches, b=83 inches, c=60 inches, and d=76 inches, how much fabric is needed to make the tent?

It takes Destiny y 4 hours to file all the daily paperwork. It takes Susan 5 hours to file the same paperwork. If they work together, how long will it take them?

If the mean for a sample of 8 people was 10 and the mean for a second sample of 4 people was 20, what would the weighted mean be equal to?