What is the value if the digit 4 in the number 524,897,123

Which of the following is correct interpretation of the expression -4+13

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x