Jamie is hiking up a small mountain at a constant rate of 300 feet/hour. He must climb 1,500 feet to reach the peak. After that, he hikes down at the same rate to the base of the mountain. The equation that can be used to find the number of hours, t, after which Jamie's distance from the peak will be 900 feet is . Jamie will be 900 feet from the peak after hours and after hours.

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

Trent wants to buy 2 packs of trading cards for 3 dollars each. the trading card packs that trent normally buys tend to come in packs of 6, 10, 12, or 15 cards. after selecting 2 packs, trent found that the first pack of cards cost 25 cents per card, and the second pack cost 30 cents per card. trent uses this information to write the equations below in order to compare c, the number of cards in each pack.

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys