1. 3x = 42 2. x ➗ 5 = 24

3. x ➗ 2.1 = 4.4
4. 5x = 80

5. 88 = x ➗ 2.2
6. 1.4x = 15.4

7. 7x = 54.6
8. 144 = x ➗ 3.1

9. x ➗ 7.5 = 3.5
10. 2.64 = 0.4x

11. 13x = 117
12. x ➗ 3 = 0.67

Step-by-step explanation:

yes all this answer are right

I DON"T UNDERSTAND

Step-by-step explanation:

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solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204