91Ó°ÊÓ

Solve each percent problem. In \(2013,\) mobile messaging service WhatsApp had 300 million monthly active users worldwide. By \(2017,\) this number had increased \(333.3 \% .\) To the nearest million, what was the number of WhatsApp monthly active users worldwide in \(2017 ?\)

Marina City in Chicago is a complex of two residential towers that resemble corncobs. Each tower has a concrete cylindrical core with a 35 -ft diameter and is \(588 \mathrm{ft}\) tall. Find the volume of the core of one of the towers to the nearest whole number.

Solve each problem involving consecutive integers. Find four consecutive integers such that the sum of the last three is 86 more than the first.

Solve each equation, and check the solution. If applicable, tell whether the equation is an identity or a contradiction. \(4[2 x-(3-x)+5]=-(2+7 x)\)

The circumference of a circle is \(480 \pi\) in. (a) What is its radius? (b) What is its diameter?

Solve each equation, and check the solution. If applicable, tell whether the equation is an identity or a contradiction. \(-[6 x-(4 x+8)]=9+(6 x+3)\)

The radius of a circle is 2.5 in. (a) What is its diameter? (b) What is its circumference?

Solve each percent problem. In \(2016,\) the average cost of a Thanksgiving turkey was \(\$ 22.74 .\) This price had decreased by \(1.58 \%\) in \(2017 .\) What was the average cost of a Thanksgiving turkey in \(2017 ?\)

Solve each problem involving consecutive integers. Find three consecutive even integers such that the sum of the least integer and the middle integer is 26 more than the greatest integer.

Solve each percent problem. At the end of a day, Lawrence found that the total cash register receipts at the motel where he works were \(\$ 2725 .\) This included the \(9 \%\) sales tax charged. Find the amount of tax.