Gayle buys 8 biros for £3.
three of them are black.
the others are red.
each red biro costs 45p.
hat is the cost of one black biro?

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

Adriana sold 50 shares of a company’s stock through a broker. the price per share on that day was $22.98. the broker charged her a 0.75% commission. what was adriana’s real return after deducting the broker’s commission? a. $8.62 b. $229.80 c. $1,140.38 d. $1,149.00

Which strategy is used by public health to reduce the incidence of food poisoning?