The difference of two numbers.(a, b) is 21. the difference of 5 times a and 2 times b is 18. what are the values of a, b?

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

Will mark the brainliest. paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each?