The answer is: [B]: " 1.75 * 10⁻¹⁵ " .
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Note:
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(2.5 * 10</span>⁻¹⁰<span>)(7 * 10</span>⁻⁶) = (2.5)*(7) *(10⁻¹⁰) *(10⁻⁶)
Note: (10⁻¹⁰) *(10⁻⁶) = 10⁽⁻¹⁰⁾⁺⁽⁻⁶⁾ = 10⁽⁻¹⁰⁻⁶⁾ = 10⁽⁻¹⁶⁾
{Note: xᵃ * xᵇ = x⁽ᵃ⁺ᵇ⁾ } ; ===> Property of exponents;
So; (2.5)*(7) *(10⁻¹⁰) *(10⁻⁶) = (2.5)*(7) * 10⁽⁻¹⁶⁾ ;
2.5 * 7 = 17.5 ;
so; (2.5)*(7) * 10⁽⁻¹⁶⁾ = 17.5 * 10⁻¹⁶
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SInce the answer choices are given in scientific notation;
in terms of "1.75"; we rewrite this value in such format to get the equivalent value; by dividing by "10" ; to get: "1.75 * 10⁻¹⁵ " (note: this value is equivalent; since the number of "zeros" is adjusted.
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The answer is: [B]: " 1.75 * 10⁻¹⁵ " .
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We need two equations for this.
A) (H * J) / (H + J) = 3
Harry is 8 hours faster than Jimmy
B) H + 8 = J
Inserting equation B into A gives us:
A) (H * (H+8))/ (H + H +8) = 3
H^2 +8H / (2H +8) = 3
H^2 + 8H = 6H + 24
H^2 + 2H -24 = 0
H = 4
and so J = 12
Harry takes 4 hours and Jimmy takes 12 hours.
Answer:
A
Step-by-step explanation:
it's graphical represent is mistake.
Let x = the number of total students in the class
Convert the percent into a decimal by moving the percent sign two places to the left and change the percent sign into a decimal point.
60% = 0.6
Then 0.6x = the number of girls in the class
Then 0.6x + 30 = the total number of students in the class
0.6x + 30 = x
Solve for x.
0.6x + 30 = x
0.6x = x - 30 <-- Subtract both sides by 30
-0.4x = -30 <-- Subtract both sides by x
x = 75
Now we have the total number of students in the class.
60 percent of the students are female.
0.6 * 75 = 45
So, C 45 is the answer.
Answer:
The surface area is 162 yards
Step-by-step explanation:
A = 2(w l + h l + h w)
A = 2(7 (3) + 6 (3) + 6 (7))
7 x 3 = 21
6 x 3 = 18
6 x 7 = 42
21 + 18 +42 = 81
81 x 2 = 162