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22savage2017
04.08.2019 •
Mathematics
Question 10 a principal buys x small tables and y large tables for a computer lab. each small table costs $34. each large table costs $52. the total cost of the tables is less than $3,500. the principal buys fewer than 50 tables. which two inequalities could represent this situation? a.34x+52y< 3500 x+y< 50 b.34x+52y< 3500 x+y> 50 c.52x+34y< 3500 x+y< 50 d. 52x+34y< 3500 x+y> 50 the prices for different types and amounts of building bricks are given. select the options that have the same cost per brick. a.1500 bricks for $1,110.00 b.1300 bricks for $845.00 c.230 bricks for $170.20 d.100 bricks for $75.00 e.35 bricks for $25.90
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Ответ:
Ответ:
The second one is A, C, and E. Just divide the cost by the number of bricks to get the cost per brick. A, C, and E are all $0.74 per brick.
Ответ:
5 5/7 liters of 5%
4 2/7 of the 40 %
Step-by-step explanation:
we need 10 liter of a 20 % solution
We have x liters of 5% and since there is a total of 10 liters we have 10-x of the 40 % solutions
10 * .20 = .05 x + .40 ( 10-x)
2 = .05x +4 - .4x
Combine like terms
2 = 4- .35x
Subtract 4 from each side
2-4 = -.35x
-2 = -.35x
Divide by -.35
-2/.-35 =x
40/7 =x
5 5/7 =x
10 -5 5/7 = 4 2/7
4 2/7 of the 40 %