Use the pH scale to solve the problem. Use the given concentration [H+] of a substance to calculate the pH value of the substance and classify the substance as an acid or a base. Round to two decimal places.[H+] = 4.6 × 10-6
A. pH ? 5.34, acid
B. pH ? 6.34, acid
C. pH ? 6.66, base
D. pH ? 2.76, acid
Answer: A
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Find a Cartesian equation for the line whose polar equation is given.r cos
= 2
A. y = 
x - 2
B. y = 
x + 4
C. y = 
x - 2
D. y = x - 4
Write the number in words.570,060,825
A. five hundred seventy million, sixty thousand, eight hundred twenty-five B. five million, seven hundred six thousand, eight hundred twenty-five C. fifty-seven million, sixty thousand, eight hundred twenty-five D. five hundred seventy million, six hundred thousand, eight hundred twenty-five
John and Loretta Smith are in the 28% tax bracket. Their joint taxable income is $134,899. If the first $16,050 is taxed at 10%, with the remainder at 28%, how much tax will they owe?
A. $29,371.72 B. $30,271.75 C. $34,882.72 D. $38,724.75
Indicate whether the value of x shown is a solution to the given equation by answering true or false.Value of x: -5
Equation: 8x + 5 = 9x + 10
A. True B. False