(a) 95 = (x+7)*(x-7)
(b) 95 = (x+7)*(x-7)
Expand the brackets:
95 = x² -7x + 7x -49 = x² - 49
Subtract x² from both sides:
95-x² = -49
Subtract 95 from both sides:
-x²=-49-95
-x²= -144
Divide both sides by -1 to get rid of the negative numbers:
-x²/-1=-144/-1
x²=144
Take the square root of 144:
x = ± squareroot of 144
x = 12 or -12
x = 12 because you cannot have a negative age so Trina is 12 years old.
Answer:
x+6.3
Step-by-step explanation:
x+6.3
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Answer:
470% is equivalent to the decimal 4.7, which can be rounded to 5
So, 470% of 40 is approximately equal to 5 times 40
which is equal to 200
So, a good estimate for 470% of 40 is 200.
