(x + a) (x + b) = x² + (a + b) x + ab
75 * 77=
=(70+5)(70+7)
=70²+(5+7)*70+5*7
=4900+12*70+35
=4900+840+35
=5775
Answer:
x¹²,8x⁴,6x,2x,1
Step-by-step explanation:
x²×x⁶×x⁴=x¹²
x^4(8) =8x⁴
x^1(6) =6x
x^1(2) =2x
x^0 = 1
We need to find the surface area of the solid.
Since it's formed by cubes with edges of 1 meter, each square on the surface of the solid has an area equal to:

Thus, to find its surface area, we need to count the number of squares on its surface, and then multiply this number by 1 meter².
We can see that this solid has two equal latera surfaces (right and left). Each one of them has 17 squares.
Also, the number of squares on the horizontal surfaces is the same on the top and bottom of the solid. Each one of them has 10 squares.
And the vertical surfaces on the front and back of the solid have the same number of squares: 8 squares each.
Then, adding those quantities and multiplying the result by two, we find the total number of squares on the surface of the solid:

Therefore, the surface area of the solid is 70 m².
Mei will have written a total of 430 pages at the end of the 30 days.
- The number of already written pages by Mei is 250.
- The speed of Mei is 6 pages per day.
- The total time is 30 days.
- The number of pages written in 30 days by Mei is 30*6.
- Mei's number of pages written in 30 days is 180.
- Mei's total number of pages that she will have written at the end of 30 days is 250 + 180.
- The total number of pages that Mei will have written at the end of 30 days is 430.
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