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stepladder [879]
3 years ago
9

I need help with 9and 10 pleas

Mathematics
1 answer:
sergejj [24]3 years ago
8 0
9 is D
10 is either a or b
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Karla sold a bicycle on e-store for $97.50. this selling price represented a 30% profit for her, based on what she had originall
kotykmax [81]
  x + 30% x = 97.5 $

x+ 0.3 x = 97.5

x(1+0.3) = 97.5 

1.3 x =   97.5

x= 97.5/ 1.3=  75 $  its original price
3 0
3 years ago
Soybean mean is 14% protein; cornmeal is 7% protein. How many pounds of each should be mixed together in order to get 280-lb mix
Marianna [84]

I have to form a couple of equations in order to solve it.

let the amount of soybean in the mixture be x and that of cornmeal be y

Step-by-step explanation:

x+y = 280

y = 280 - x

x*(14/100) + y*(7/100) = 280*(12/100)

Multiplying the whole equation by 100;

14x + 7y = 3360

in this equation,put y = 280 - x

14x +7 (280-x) = 3360

14x +1960 - 7x = 3360

14x - 7x = 3360 - 1960

7x = 1400

x = 200lbs

y = 280 - x

= 280 - 200

= 80 lbs

Inorder to make a 280lbs mixture having 12% protein, we should mix 200lbs of soyabean and 80 lbs of cornmeal

8 0
3 years ago
Choose the answer that expresses .74 as a fraction
SCORPION-xisa [38]

Answer:

37/50

Step-by-step explanation:

as a fraction simplified

8 0
3 years ago
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If the simple interest on ​$7,000 for 3 years is ​$1,680 , then what is the interest​ rate?
Fudgin [204]

Answer:

Calculate Principal, Interest Rate, Time or Interest. ... You received $72 in interest after 3 years. ... where I is interest, P is total principal, i is rate of interest per year, and t is total time in years. In this example I = $72, i = 4% and t = 3 years, so ...

Step-by-step explanation:

5 0
3 years ago
Simplify into a single log with a single argument:
julia-pushkina [17]

Answer:

2 \log_8 8

Step-by-step explanation:

3 \log_8 8 - 2 \log_8 4 + \log_8 2 =

= 3 \log_8 8 - 2 \log_8 4 + \log_8 2

= 3 \log_8 8 - 2 \log_8 8^\frac{2}{3} + \log_8 8^\frac{1}{3}

= 3 \log_8 8 - 2 \times \dfrac{2}{3} \log_8 8 + \dfrac{1}{3} \log_8 8

= 3 \log_8 8 - \dfrac{4}{3} \log_8 8 + \dfrac{1}{3} \log_8 8

= 2 \log_8 8

Which equals simply 2 since log base 8 of 8 is 1.

5 0
3 years ago
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