Answer:
70
Step-by-step explanation:
because 70 times 6 equals 420
Rocco and Guilia can paint and finish together in 3 hours while Rocco alone can do it alone in 7 hours. Guilia at the rate of 1/r can finish the job expressed in the following equation. 1/3= 1/7+1/r. Getting r, r is equal to 5.25 hrs. Hence, Guilia can do painitng alone in 5.25 hrs.
2(x + 1) = 10
2x + 2 = 10
2x +2 -2 = 10 - 2
2x = 10 (step 3)
2x/2 = 8/2
x = 4
Formula Given:
2(x + 1) = 10
2 Multiply by (x + 1) - Distribution Characteristic
2x + 2 = 10 to open the brackets.
Subtract 2 from both sides.
2x + 2 - 2 = 10 - 2 (equals subtraction property)
2x = 8 (justified in step 3).
Divide both sides by 2
2x/2 = 8/2 - property of equal division.
therefore
x = 4. (solved)
The division is one of the four basic operations in arithmetic, a way of combining numbers to form a new number. Other operations are addition, subtraction, and multiplication.
Learn more about division here
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