Danny sails a boat downstream. the wind pushes the boat along at 21 km/hr. the current runs downstream at 15 km/hr. what is the actual velocity of the boat?

6.0 km/hr, downstream
1.4 km/hr, downstream
310 km/hr, downstream
36 km/hr, downstream

What is the molecular formula for a compound that is 46.16% carbon, 5.16% hydrogen, and 48.68% fluorine? the molar mass of the compound is 156.12 g/mol

The minerals found in bones are deposited by living cells called

The table lists the lattice energies of some compounds.compoundlattice energy (kj/mol)lif            –1,036licl            –853naf            –923kf            –821nacl            –786which statement about crystal lattice energy is  best  supported by the information in the table? the lattice energy increases as cations get smaller, as shown by lif and kf.the lattice energy increases as the cations get larger, as shown by lif and licl.the lattice energy decreases as cations get smaller, as shown by nacl and naf.the lattice energy decreases as the cations get smaller, as shown by naf and kf.