Answer:
S₁₅ = 645
Step-by-step explanation:
The sum to n terms of an arithmetic sequence is
=
[ 2a₁ + (n - 1)d ]
where a₁ is the first term and d the common difference
Using the nth term formula = 5n + 3 , then
a₁ = 5(1) + 3 = 5 + 3 = 8
a₂ = 5(2) + 3 = 10 + 3 = 13 , then
d = a₂ - a₁ = 13 - 8 = 5
Thus
S₁₅ = [ (2 × 8) + (14 × 5) ]
= 7.5( 16 + 70)
= 7.5 × 86
= 645
There was 33.3% error in her calculation.
Step-by-step explanation:
Approx value thought by Lauren = 100
Exact value counted = 75
Percent error =
Rounding off to nearest tenth;
Percent error = 33.3%
There was 33.3% error in her calculation.
Keywords: percentage, error
Learn more about errors at:
#LearnwithBrainly
Answer:
4th option: 1953.08 mm
Step-by-step explanation:
circumference of circle=
Thus, circumference of wheel