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r-ruslan [8.4K]
2 years ago
10

Solve 7k÷3=21 The solution is k __

Mathematics
2 answers:
klemol [59]2 years ago
5 0
9
Because 21*3=63
63/7=9
qaws [65]2 years ago
4 0
First, multiply by 3 on both sides:
7k = 63

Divide by 7:
k = 9

So, k = 9
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A chef is going to use a mixture of two brands of Italian dressing. The first brand contains 9% vinegar, and the second brand co
pishuonlain [190]
Let the amount of the first brand be x, and let the amount of the second brand be y.
0.09x + 0.14y = 240 * 0.13 .................(1)
x + y = 240 ..............(2)
y = 240 - x .......................(3)
Plugging the value for y from equation (3) into equation (1), we get:
0.09x+0.14(240-x)=240\times0.13 ...............(4)
Equation (4) simplifies to:
-0.05x = -2.4
giving the value for the required amount of 9% vinegar as 48 ml and the required amount of 14% vinegar as 240 - 48 = 192 ml.
7 0
2 years ago
Solve for x, give exact answers: 6x^2 - 7x - 3 = 0
Novosadov [1.4K]

Answer:

Step-by-step explanation:

6x∧2-7x-3=0

the coefficient of x² multiplied by -3 = -18

we need to look for 2 numbers that when we add it to together it will equate to -7x

+2 and -9 is the answer

6x∧2+2x-9x-3=0

2x(3x+1)-3(3x+1)=0

(2x-3)(3x+1)=0

equate each brackets to 0

2x-3=0   3x+1=0

2x=3        3x=-1

x=3/2         x=-1/3

4 0
3 years ago
Read 2 more answers
Simplify 8.9 – 1.4x + (–6.5x) + 3.4
Aleks [24]

Answer:

-7.9x+12.3

Step-by-step explanation:

8 0
2 years ago
to prepare a pesticide spray 3.5 lb of spray is added to 30 gal of Water how much pesticides spray should be added to spray tank
amm1812
I got 41.4 lbs if you round to the nearest tenths
6 0
3 years ago
Evaluate the following expression.
melisa1 [442]

Answer:

40

Step-by-step explanation:

y = 4

z = 2

8y + 12 - 2z

8(4) + 12 - 2(2)

32 + 12 - 4

44 - 4

40

8 0
2 years ago
Read 2 more answers
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