directions: algebra for what values of X and Y must each figure be a parallelagram? ( if you could just explain to me how to do it nd walk me through the steps that would be great. i have more problems if people are willing im not asking to solve im just asking to teach me how to do it quickly.) i have a cashapp for people who are tryna help me with a couple im feeling generous.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

If on=8x-8,lm=7x+4,nm=x-5,and ol=3y-6

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec