If 3x + 5y = 42 and 9x + 7y = 78, then x + y = ?

In the supermarket, there is a scale that measures the weight of fruit and vegetables. The needle is 24 cm long, and it rotated 96° when Charlie placed four tomatoes on it. How far did the needle travel as it rotated? 1152π 2304π 5pi/64 64pi/5

19x^2+7-[3 (x^2-7) + 9] How do you simplify

Miss Perkins buys 1.8 pounds of ground beef to make tacos ground beef cost $4.75 per pound how much does Miss Perkins spend for ground beef

Round 3,556 to the nearest hundred

A pulley system has a mechanical advantage of 5. make a graph with the input force on the x-axis and the output force on the y-axis. choose five different values of the input force, and plot the resulting output force on your graph.

Write an inequality that represents the description and then solve. Dave has $15 to spend on an $8 book and two birthday cards (C) for his friends. How much can he spend on each card if he buys the same card for each friend?

How many terms are in the arithmetic sequence - 27, - 16, - 5, ..., 292? Hint: a_n=a_1+d (n-1), where a_1 is the first term and d is the common difference

Rachel invested $15,000 in a nine-year CD giving 8.5% interest, but needed to withdraw $4,000 after two years.

What temperature is equivalent to 373 k? a. 0 °c b. 50 °c c. 100 °c d. 373 °c

A test has a mean of 65 with standard deviation of 5. What percent of the students would you expect to receive a grade of 55 or more? a. 2.5% b. 95% c. 13.5% d. 97.5% e. none of the above