PSAT Math Grid-Ins Practice Test 6

1. k(10 x - 5) = 2(3 + x) - 7

If the equation above has infinitely many solutions and k is a constant, what is the value of k ?

2. A right triangle has leg lengths of 18 and 24 and a hypotenuse of 15 n. What is the value of n ?

3.

If the expression above is combined into a single power of x with a positive exponent, what is that exponent?

4.

If the equation of the parabola shown in the graph is written in standard quadratic form, y = ax² + bx + c,and a = -1, then what is the value of b ?

5. If , what is the value of 9x + 10y ?

6. How many degrees does the minute hand of an analog clock rotate from 3:20 p.m. to 3:45 p.m.?

7.

What is the exponent on x when the expression above is written in simplest form?

8. An exponential function is given in the form f(x) = a · b^x. If f(0) = 3 and f(1) = 15, what is the value of f(- 2)?