we are given that out of 100 light bulbs, 7 of them were defective. We can assume that out of every 100 lightbulbs, 7 of them will be defective.
we can write this as a ratio of defective lightbulbs to total
7:100
we want to see how many defective there are when we have 3000 bulbs, to do this we can multiply both numbers by 30
7 * 30 = 210
100 * 30 = 3,000
our new ratio is now
210:3,000
so we are now able to say that in a lot of 3,000 lightbulbs, there would be 210 defective bulbs.
hope this helped!
Hey You!
0.90 × 8 = 7.20
Susan will need 7.2 gallons of paint to paint 8 walls.
Answer:
By cos Rule: c² = a² + b² -2abcosФ
c = 7.7
Step-by-step explanation:
∵ AC = 10 , BC = 16 , m∠C = 22°
∴ We can use the cos Rule:
∵ c² = a² + b² -2abcos(C)
∴ c² = (10)² + (16)² - 2 × 10 × 16 cos(22)
∴ c² = 100 + 256 - 320cos(22) = 59.301167
∴ c = 7.7
Answer:
10x²+28x+15
Step-by-step explanation:
(2x²+3)(4x+5)-8x(x²-2)=
8x³+12x+10x²+15-8x³+16x=
10x²+28x+15
1. 2 X 3/8 X 3 X 3/7
Reduce the numbers with 2
2. 3/4 X 3 X 3/7
Multiply the fractions
To get 9/28 then x by 3
Answer should be 27/28