If the pattern shown continues how many black keys appear on an organ with a total of 240 keys

A plumber charges a visitation fee of $60 and $45 per hour for time worked. If h is the number of hours worked and t is the total charge for completed work, then the variables are related by the equation t = 45h + 60.

Write an equation. Let x be the unknown number. eight subtracted from a number is 6.

A rectangular garden is 15 feet by 9 feet. What is the area of the garden?

Mike sells used cars. He makes $250 per week plus $200 for each car he sells. Because Of Mike's cost of living. He needs to earn at least $1250 per week to pay off all of his extravagant bills.

At a certain vineyard it is found that each grape vine produces about 10 lb of grapes in a season when about 500 vines are planted per acre. for each additional vine that is planted, the production of each vine decreases by about 1 percent.

Which percent is equivalent to 1/20

I am currently learning Complex Numbers, and I know nothing. so any info on this?

Rue or false? using the regression equation to make predictions for values of the predictor variable outside the range of the observed values of the predictor variable is risky and unreliable.

4 (x+1) - 7 = 3 (x-1) + x

Ben is sailing on a ship. The ship goes 600 miles north and then turn west. It travels 200 miles west and turns sought for 450 miles. It turns west again and travels 170 miles and turns south once more and travels 150 miles.