Which is the directrix of parabola with equation x^2=4y

The teacher marked Silvano's problem wrong on his test. (4^5) ^4 Explain what he did wrong and give the correct answer.

When Arjun makes hot cocoa, he adds 20ml of chocolate syrup for every 3 ounces of hot water. Arjun's brother, Eli, adds 45mL of chocolate syrup for every 6 ounces of hot water.

Caroline of making 8 batches of biscuits each batch uses 5/6 cup of flour how many cups of flour does Caroline need

42.8571[4 (3+5) ] + 27

What is 4 1/4 - 3 3/5

You work at a bridal shop. You need to find out how much satin you will need to make four bridesmaids' dresses and two flower girls' dresses. Each bridesmaid's dress requires 4.5 yards of satin, and each flower girls dresses requires 3.

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.