GED Math Practice Test 1

The price quote, P, will be equal to the total amount of charges. It’s given that there is a $25 base charge, so we can begin by writing the price quote as P = $25. To this base charge of $25, $8 per each bathroom, represented by the variable B, is added; our price quote is now P = $25 + $8B. Lastly, $4 per each other room, R, is added, and the actual price quote is P = $25 + $8B + $4R, or P = 25 + 8B + 4R.

The coordinate plane is formed by a horizontal x-axis and a vertical y-axis that intersect at the origin, represented as (0, 0). Points on the plane have both an x coordinate and a y coordinate and are written in the form (x, y). Negative x values are to the left of the origin, positive x values are to the right of the origin; negative y values are below the origin, and positive y values are above the origin. In this case, the point is to the left and above the origin. The only answer choice containing a negative x coordinate must be correct.

This is a function problem. A function relates an input to an output. To find ƒ(2.5), substitute 2.5 for every x in the original function and evaluate the expression:

ƒ(2.5) = 2(2.5)² − 3(2.5) +7
ƒ(2.5) = 2(6.25) − 7.5 + 7
ƒ(2.5) = 12.5 − 7.5 + 7
ƒ(2.5) = 12

In order to solve inequalities in one variable, follow the order of operations (PEMDAS) to simplify the expressions, then combine like terms, then isolate the variable. Inequalities can be treated much like equations, but with one major difference: when multiplying or dividing either side of an inequality by a negative value, the direction of the inequality symbol must switch.

In this case, begin by multiplying the 3 through the parentheses, before then isolating the variable:

5x + 8 < 3(x + 2)
5x + 8 < 3x + 6
2x + 8 < 6
2x < −2
x < −1

Recall that the multiplication of terms sharing the same base can be simplified by adding the exponents: x^a * x^b = x^{(a + b)}. If this rule is forgotten, you can quickly derive it by considering the simple case of 2¹ * 2², which can be rewritten as 2 * 2 * 2, or 2³. The expression in this case, then, can be simplified as:

(x⁶) (x⁵) = x⁵⁺⁶
= x¹¹

Begin by writing out the formula for the area of a circle, which is one of the formulas provided on the GED Formula Sheet. Next, substitute the given value for the area, and then solve for the radius. Recall that the square root of both sides must be evaluated in order to isolate r. Multiplying the value of r by 2 gives the diameter:

The average of a set of data points is the sum of the data points divided by the total number of data points. In this case, we are given 5 out of 6 data points, the number of data points, and the desired average. Substitute the given values into the formula for the average, using a variable to represent the unknown test score, and then solve for the variable:

Average = sum of data points ÷ number of data points

75 = (50 + 52 + 77 + 88 + 91 + x) ÷ 6

Now solve for x. Start with the addition:
75 = (358 + x) ÷ 6

Next, eliminate the denominator by multiplying both sides by 6:
450 = 358 + x

The last step is to subtract 358 from both sides:
x = 92

The vertical bars surrounding a − b designate the absolute value of the difference. The absolute value of an expression is the distance from the simplified expression to 0; absolute value is always positive. Substitute the given values of a and b into the expression, evaluate the difference, and then apply the absolute value to make it positive.

|a − b|
= |−4 − 3|
= |−7| = 7

Recall that −4 − 3 is equivalent to −4 + −3 = −7

An equation of the form y = ax + b, where a and b are constants, designates a straight line and is known as the slope-intercept form of the line because it explicitly provides both the slope and y-intercept. The variable a represents the slope of the line, which can be negative, zero, positive, or undefined; the variable b represents the y-intercept, or the point along the y-axis at which the line crosses.

In this case, the slope of the line, also known as the “rise over run”, is positive 2, indicating that the line rises from left to right. The y-intercept is positive 1, indicating that the line passes through the point (0, 1). Lines can always be easily graphed by forming an (x, y) table, substituting values of either x or y, and solving for the other variable. Once two points on the line are known, the line can be accurately graphed.

The probability of an event taking place is the ratio of the number of successful events to the total number of possible events. In this case, a successful event is randomly selecting a male from the group. The total number of possible events is the number of people in the group. The ratio is then: