Answer:
first one with -1...21
Step-by-step explanation:
only one that follows quadratic formula format
Let x=grams of 70% alloy:
0.70x+16×0.20=0.30(x+16)
0.70x=0.30x+4.8-3.2
0.40x=1.6
x=1.6/0.4=16/4=4g
4 grams of 70% alloy are needed.
209 rounded to the nearest ten; 210
209 rounded to the nearest hundred; 200
Hope this helped ;)
Answer:
10
Step-by-step explanation:
To figure the mean, add up the numbers, 3+3+6+7+9+12+12+19=71 then divide it by the number of data points 71/7=10.1428571, I rounded it to 10.
Number one is 13.2 now hold up while I do the rest