Solve, using the substitution method.
y + 2x = 7
14 – 4x = 2y

a. the solution is (1, 5)

b. the solution is (21, 0)

c. there are an infinite number of solutions.

d. there is no solution.

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days

Acolony contains 1500 bacteria. the population increases at a rate of 115% each hour. if x represents the number of hours elapsed, which function represents the scenario? f(x) = 1500(1.15)" f(x) = 1500(115) f(x) = 1500(2.15) f(x) = 1500(215)