Answer:
Step-by-step explanation:
a^2+b^2=400
a^2=400-b^2
a=sqrt(400-b^2) & -sqrt(400-b^2)
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b^2=400-a^2
b=sqrt(400-a^2) & -sqrt(400-a^2)
Answer:
80 cm², 180 cm²
Step-by-step explanation:
The ratio of areas is the square of the ratio of perimeters:
2²:3² = 4:9
The sum of these "ratio units" is 4+9 = 13, corresponding to a sum of areas of 260 cm². Hence each "ratio unit" represents (260 cm²)/13 = 20 cm². Then the two areas are ...
• 4×20 cm² = 80 cm²
• 9×20 cm² = 180 cm²
Answer:
3rd option
Step-by-step explanation:
-8 ≥ -5x + 2 > -38 subtract 2 from all three expressions
-10 ≥ -5x > -40 divide by 5
-2 ≥ -x > -8 now multiply by -1
2 ≤ x < 8
Answer:
Probability that a randomly selected student plays sport and is in band = 1/50
Step-by-step explanation:
Total number of students= 1900
Percentage of those that play sport and are in band = 2%
Hence those that play sport and are in band = 2/100 x 1900 = 38 students
Probability that a randomly selected student plays sport and is in band = 38/1900 = 1/50