Select the proper placement for parentheses to speed up the addition for the expression 2 + 9 + 8 + 1 A. (1 + 2) + (9 + 8) B. (9 + 2) + (8 + 1) C. (8 + 2) + (9 + 1) D. (8 + 9) + (2 + 1)

A rocket launched at an angle into outer space. After a minute, the rocket traveled 5 miles and had an altitude of 3.5 miles. What is the angle of elevation that the rocket was launched at?

The ratio of students who own a cat to those who own a dog is 4:3 if 36 students own dogs, how many students own cats?

115 students are going on a field trip. How many buses do they need if each bus holds 30? A. 3 B. 4 C. 5 D. 6

After entering the test scores from her statistics class of 25 students, the instructor calculated the mean and the median of the scores. upon checking, she discovered that the toptop score entered was 73, but it should have been 83.

The count in a culture of bacteria was 600 after 2 hours and 38,400 after 6 hours. (a) What is the relative rate of growth of the bacteria population? Express your answer as a percentage. (Round your answer to the nearest whole number.

Decide whether a discrete or continuous random variable is the best model for each of the following variables: (a) The time until a projectile returns to earth. (b) The number of times a transistor in a computer memory changes state in one operation.

The rquation of a citcle is x^2+y^2=16 what is the radius of the circle

BETH and Carley are selling candy bars to raise money for new cheer outfits. Beth has sold one less than twice the number of candy bars carely has sold. If they have 188 candy bars in all how many has Beth sold?

Mr. Smith has 28 sixth graders and 35 seventh graders. If he wants to break the two grades into identically sized groups without any students left over, how many students should be in a group

1. What is a perfect square? 2. What is the square root of 4x²? 3. What is the square root of 25? 4. Factor 4x² + 20x + 25.