**Weegy:** (-5.12) - (-4.7) + (7.021) = -5.12 + 4.7 + 7.021; = 6.601

**User:** What is the algebraic expression for "the difference between seven times a number and three times that number"?

**Weegy:** An equation is written in a a sentence; a expression is written as a phrase. Equations are solved; Expressions are simplified.

**User:** Given the line 2x - 3y - 5 = 0, find the slope of a line that is perpendicular to this line

**Weegy:** Given the line 2x - 3y - 5 = 0, the slope of a line that is perpendicular to this line is -3/2.

**User:** Given: y varies directly with x and has a constant rate of change of 7.
When the value of y is 12, then the value of x would be _____.

**Weegy:** If y is 2.5 when x is 5 and y varies directly with x, the equation is y = kx where k is the constant. With given values k = y/x = 2.5/5 = 0.5 The equation is y = 0.5x. when x is 10, y = 0.5(10) = 5.

**User:** What is the fractional equivalent of 0.2323...?

**Weegy:** 23/99

**User:** A person has 17 coins, all nickels and dimes, worth $1.25. How many nickels are there

**Weegy:** d + n = 17
0.1d + 0.05n = 1.25
d = 17 - n
0.1 (17 - n) + 0.05n = 1.25
1.7 - 0.1n + 0.05n = 1.25
1.7 - 0.05n = 1.25
-0.05n = -0.45
n = 9
9 Nickels, 8 Dimes

**User:** The length of a rectangle is 3 inches more than its width, and its perimeter is 22 inches. Find the width of the rectangle.

**User:** What is the equation of the line, in slope-intercept form, that passes through (3, -1) and (-1, 5)?

**Weegy:** The equation of the line, in slope-intercept form, that passes through (3, -1) and (-1, 5) is y = -3/2x + 7/2

**User:** If the first equation is multiplied by 3 and then the equations are added, the result is _____.
3x + y = 3
x - 3y = -2

**Weegy:** 10x=7

**User:** A man invests a certain amount of money at 2% interest and $800 more than that amount in another account at 4% interest. At the end of one year, he earned $92 in interest. How much money was invested in each account?

**Weegy:** Let the man invest an amount x at 2% ...

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