Answer: girls=20, sister=10
Step-by-step explanation:
Let x = the girl's sister's age (present)
Let 2x= the girl's age (present)
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According to the question
(x+5)(2x+5)=375
Expand parentheses by FOIL (First Outer Inner Last)
2x²+5x+10x+25=375
Combine like term (5x and 10x)
2x²+15x+25=375
Subtract 375 on both sides
2x²+15x+25-375=375-375
2x²+15x-350=0
Find the factors (cross factor)
(x-10)(x+17.5)=0
x=10 or x=-17.5 (rej) ⇔ the age can't be negative
the girl's age is 20, and her sister's age is 10.
<span>Answer:
Calculating the t test statistic
t = (xbar - mu)/(s/sqrt(n))
t = (4.40-4.66)/(0.28/sqrt(6))
t = -2.27452618972722
t = -2.275
The t test statistic is approximately -2.275</span>
circumference of circle = 2×3.14×50
circumference = 100×3.14
circumference = 314m
option c is correct answer friend
Answer:
16.66
Step-by-step explanation:
1) eliminate constant first by performing the opposite operation:
0.24a+0.5-0.5=4.5-0.5
0.24a=4.0
divide both sides by 0.24
a=16.66
The Pythagorean theorem tells you the other leg is
... √(c² - a²) = √(4.2² -2.9²) = √9.23 ≈ 3.038 ≈ 3.0
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There is insufficient information to do anything with forces.
