Solve each system of equations using substitution

Y=X

X-4Y=0

What is the correct definition for sec 0?

At a certain coffee shop, all the customers buy a cup of coffee; some also buy a doughnut. The shop owner believes that the number of cup s he sells each day is normally distributed with a mean of 320 cups and a standard deviation of 20 cups.

6438593 rounded to the nearest 1000

Decompose each multiple of tens hundreds or thousands before multiplying

For the function given, state the period: f (t) = -100sin (50t-20). A. pi/25 B. 5/2 C.-50pi^2/3 D. 50

A necklace is valued at £1200 It's value is expected to increase by 4.5% per year over the next 3 years. Calculate the expected value of the necklace after this time

Natalie drives 2.4 miles round trip each time she goes to the grocery store. Which expression can Natalie use to determine the number of miles she drives in 8 round trips to the grocery store?

Josiah conducts an experiment that has 4 possible outcomes. Sally conducts an experiment that has 10 possible outcomes. The students conduct 50 trials each. Which statement best compares the two experiments?

Can - 20 and 20 be expressed with a less than or equal to sign? Example: - 20 _< 20.

Train travels 60 miles in 40 minutes what is the average speed