Directions: Simplify the following monomials (if possible). 9.) -25xy² - 25xy²
10.) -50ac²d + ac²d
11.) 3y + 9z + 4y - 3z
12.) 12b + 8a - 10b

ANYONE PLEASE HELP ME IN 9-12:(​

How many glue sticks are in a basket containing 96 scissors, if the ratio of glue sticks to scissors is 19 to 57.

Anormally distributed data set has a mean of 176.3 and a standard deviation of 4.2. what is the approximate z-score for the data value of 167.9? 2.00 −2.00 8.4 −8.4

Mario is constructing a frame for 10 in. by 8 in. photo. he wants the frame to be the same with all the way around in the same area of the frame and photo to be 120 square inches what is the dimension of the frame?