State the number of positive and negative real roots

x^7-2x^6-19x+20=0

Yoko has scored 81, 84, 84, 69, and 76 on her previous five tests. What score does she need on her next test so that her average (mean) is 81?

Janet bought a shirt for $21.88 and a pair of pants for $43.95. How much did Janet spend? A. $65.83 B. $65.73 C. $64.73 D. $62.13

Milan invested his savings in two investment funds. the $4000 that he invested in fund a returned a 3% profit. the amount that he invested in fund b returned a 10% profit.

If A = (1, 4) B = (3, 1) and C = (6, 3), classify the the following triangle as either equilateral or right. Type the word equilateral or right in the blank

1) John drove his car to New York city. It took him 5 hours at speed 65m/hr. His friend took the bus for 6 hours to New York city with the same route to meet him. What is speed of the bus?

Mrs. Potts can make 5 dozen ravioli in 1 hour. Write and solve a direct variation equation to find many she can make in 2 1/2 hours.

Sal washed 5 cars in 50 minutes. how minutes does it take to wash one car

Estimate the radius of the Big Ben clock face in London to the nearest meter. Using C=44m

What is 8plus b equal

For a set of ten numbers, removing the largest number decreases the average by 1. Removing the smallest number increases the average by 2. What is the positive difference between the largest and the smallest of these ten numbers