6.988.880km = 4342668.7 miles
Answer: C.Sample 2: 10 boys and 35 girls
Step-by-step explanation:
The class president wants to survey the students at the high school about the selection of food offered by the school cafeteria. The president knows that there are 150 boys and 175 girls.
girls in the high school. Which of the following is a representative sample of the high school population?
A.Sample 4: 7 boys and 6 girls
B.Sample 1: 10 boys and 10 girl
C.Sample 2: 10 boys and 35 girls
D.Sample 3: 6 boys and 7 girls
Answer:
8.2secs
Step-by-step explanation:
Given the expression for calculating the height as;
h = -16x^2+127x+80
Given h = 40
Substitute
40 = -16x^2+127x+80
-16x^2+127x+80 - 40 = 0
-16x^2+127x+40 = 0
16x^2-127x-40 = 0
Factorize
x = -(-127)±√(-127)²-4(16)(-40)/2(16)
x = 127±√16,129+2,560/32
x = 127±√18,689/32
x = 127±136.71/32
x = 127+136.71/32
x = 263.71/32
x = 8.24
Hence the required time to the nearest tenth is 8.2secs