4. 2b-6+3b=
5b-6=143
5b=143+6
5b=149
b=149
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5
The conversion from miles to feet is 1 mile equals 5,280 feet.
So, if we multiply 2 and a half (or 2.5) by 5,280, we get 13,200 feet.
I hope I helped you!
18 students scored 80%
22 students scored 70%
((18 × .8) + (22 × .7)) ÷ .4
(14.4 + 15.4) ÷ .4
(29.8) ÷ .4
74.5
The average score of the whole class was 74.5
Answer:
72ft²
Step-by-step explanation:
Calculate the area of each face and then sum them.
area of base = 4 × 5 = 20 ft²
area of back = 5 × 3 = 15 ft²
area of sloping face = 5 × 5 = 25 ft²
area of 2 triangular faces = 2 × × 4 × 3 = 4 × 3 = 12 ft²
Thus
surface area = 20 + 15 + 25 + 12 = 72 ft²