SAT Pastpaper with Solutions

A quality control manager at a factory selects 7 lightbulbs at random for inspection out of every 400 lightbulbs produced. At this rate, how many lightbulbs will be inspected if the factory produces 20,000 lightbulbs?

A= 24 + 3.5m One end of a spring is attached to a ceiling. When an object of mass m kilograms is attached to the other end of the spring, the spring stretches to a length of A centimeters as shown in the equation above. What is m when A is 73?

The amount of money a performer earns is directly proportional to the number of people attending the performance. The performer earns $120 at a performance where 8 people attend. How much money will the performer earn when20 people attend a performance?

The amount of money a performer earns is directly proportional to the number of people attending the performance. The performer earns $120 at a performance where 8 people attend. The performer uses 43% of the money earned to pay the costs involved in putting on each performance. The rest of the money earned is the performer's profit. What is the profit the performer makes at a performance where 8 people attend?

When 4 times the number x is added to 12, the result is 8. What number results when 2 times x is added to 7?

y = x²−6x +8

The equation above represents a parabola in the xy-plane. Which of the following equivalent forms of the equation displays the x-intercepts of the parabola as constants or coefficients?

In a video game, each player starts the game with k points and loses 2 points each time a task is not completed. If a player who gains no additional points and fails to complete 100 tasks has a score of 200 points, what is the value of k?

A worker uses a forklift to move boxes that weigh either 40 pounds or 65 pounds each. Let x be the number of 40-pound boxes and y be the number of 65-pound boxes. The forklift can carry up to either 45 boxes or a weight of 2,400 pounds. Which of the following systems of inequalities represents this relationship?

A function f satisfies f(2) = 3 and f(3) = 5 A function g satisfies g(3) = 2 and g(5) = 6. What is the value of f (g(3))?

Tony is planning to read a novel. The table aboveshows information about the novel, Tony's reading speed, and the amount of time he plans to spend reading the novel each day. If Tony reads at the rates given in the table, which of the following is closest to the number of days it would take Tony to read the entire novel?

On January 1, 2000, there were 175,000 tons of trash in a landfill that had a capacity of 325,000 tons. Each year since then, the amount of trash in the landfill increased by 7,500 tons. If y represents the time, in years, after January 1, 2000, which of the following inequalities describes the set of years where the landfill is at or above capacity?

A researcher conducted a survey to determine whether people in a certain large town prefer watching sports on television to attending the sporting event. The researcher asked 117 people who visited a local restaurant on a Saturday, and 7 people refused to respond. Which of the following factors makes it least likely that a reliable conclusion can be drawn about the sports-watching preferences of all people in the town?

According to the line of best fit in the scatterplotabove, which of the following best approximates the year in which the number of miles traveled by air passengers in Country X was estimated to be 550 billion?

The distance traveled by Earth in one orbit aroundthe Sun is about 580,000,000 miles. Earth makes one complete orbit around the Sun in one year. Ofthe following, which is closest to the average speed of Earth, in miles per hour, as it orbits the Sun?

The table above summarizes the results of 200 law school graduates who took the bar exam. If one of the surveyed graduates who passed the bar exam is chosen at random for an interview, what is the probability that the person chosen did not take the review course?

The atomic weight of an unknown element, inatomic mass units (amu), is approximately 20% less than that of calcium. The atomic weight of calcium is 40 amu. Which of the following best approximates the atomic weight, in amu, of the unknown element?

A survey was taken of the value of homes in a county,and it was found that the mean home value was$165,000 and the median home value was $125,000 Which of the following situations could explain the difference between the mean and median home values in the county?

A sociologist chose 300 students at random from each of two schools and asked each student how many siblings he or she has. The results are shown in the table below.

There are a total of 2,400 students at Lincoln School and 3,300 students at Washington School.

What is the median number of siblings for all the students surveyed?

A sociologist chose 300 students at random from each of two schools and asked each student how many siblings he or she has. The results are shown in the table below

There are a total of 2,400 students at Lincoln School and 3,300 students at Washington School.

Based on the survey data, which of the following most accurately compares the expected total number of students with 4 siblings at the two schools?

A project manager estimates that a project will take x hours to complete, where x > 100. The goal is for the estimate to be within 10 hours of the time it will actually take to complete the project. If the manager meets the goal and it takes y hours to complete the project, which of the following inequalities represents the relationship between the estimated time and the actual completion time?

At a large distance r from a radio antenna, the intensity of the radio signal I is related to the power of the signal P by the formula above. Which of the following expresses the square of the distance from the radio antenna in terms of the intensity of the radio signal and the power of the signal?

I=
At a large distance r from a radio antenna, the intensity of the radio signal I is related to the power of the signal P by the formula above. For the same signal emitted by a radio antenna, Observer A measures its intensity to be 16 times the intensity measured by Observer B. The distance of Observer A from the radio antenna is what fraction of the distance of Observer B from the radio antenna?

x ² + y² + 4x − 2y = −1

The equation of a circle in the xy-plane is shown above. What is the radius of the circle?

The graph of the linear function f has intercepts at (a, 0) and  (0, b) in the xy plane. If a+b =0 and a  ≠b, which of the following is true about the slope of the graph of f?

The complete graph of the function f is shown in the xy-plane above. Which of the following areequal to 1?

I f (−4)

II f

III f (3)

Two samples of water of equal mass are heated to 60 degrees Celsius (°C.. One sample is poured into an insulated container, and the other sample is poured into a non-insulated container. The samples are then left for 70 minutes to cool in a room having a temperature of 25°C. The graph above shows the temperature of each sample at 10-minute intervals.

Which of the following statements correctly compares the average rates at which the temperatures of the two samples change?

In the xy-plane above, ABCD is a square andpoint E is the center of the square. The coordinates of points C and E are (7, 2) and (1, 0), respectively. Which of the following is an equation of the line that passes through points B and D ?

y = ax ² + b

In the system of equations above, a and b areconstants. For which of
the following values of a and b does the system of equations have
exactly two real solutions?

The figure above shows a regular hexagon with sides of length a and a square with sides of length a. If the area of the hexagon is  square inches, what is the area, in square inches, of the square?

A botanist is cultivating a rare species of plant in a controlled environment and currently has 3000 of these plants. The population of this species that the botanist expects to grow next year, Nnext year, can be estimated from the number of plants this year, Nthis year, by the equation below.

Nnext year = Nthis year+ 0 .2(Nthis year) 1 −{}

The constant K in this formula is the number of plants the environment is able to support .

The botanist would like to increase the number of plants that the environment can support so that the population of the species will increase more rapidly. If the botanist's goal is that the number of plants will increase from 3000 this year to 3360 next year,how many plants must the modified environment support?

A botanist is cultivating a rare species of plant in a controlled environment and currently has 3000 of these plants. The population of this species that the botanist expects to grow next year, Nnext year, can be estimated from the number of plants this year, Nthis year, by the equation below.

Nnext year = Nthis year+ 0 .2(Nthis year) {1 −〔〕}

The constant K in this formula is the number of plants the environment is able to support.

According to the formula, what will be the number of plants two years from now if K = 4000 ? (Round your answer to the nearest whole number.)

In the figure above, point O is the center of the circle, line segments LM and MN are tangent to the circle at points L and N, respectively, and the segments intersect at point M as shown. If the circumference of the circle is 96, what is the length of minor arc  ?

a = 18t + 15
Jane made an initial deposit to a savings account.Each week thereafter she deposited a fixed amountto the account. The equation above models the amount a, in dollars, that Jane has deposited after t weekly deposits. According to the model, how many dollars was Jane's initial deposit? (Disregard the $ sign when gridding your answer.)

In one semester, Doug and Laura spent a combined 250 hours in the tutoring lab. If Doug spent 40 more hours in the lab than Laura did, how many hours did Laura spend in the lab?

In the xy-plane, the point (3, 6) lies on the graph ofthe function)f (x) = 3x ² − bx + 12 . What is the value of b ?

If h hours and 30 minutes is equal to 450 minutes, what is the value of h ?

A coastal geologist estimates that a certain country'sbeaches are eroding at a rate of 1.5 feet per year.According to the geologist's estimate, how long will it take, in years, for the country's beaches to erode by21 feet?

In the figure above, point O is the center of the circle, line segments LM and MN are tangent to the circle at points L and N, respectively, and the segments intersect at point M as shown. If the circumference of the circle is 96, what is the length of minor arc ?