terminate called after throwing an instance of 'std::invalid_argument' what(): stoiclass Solution { public: string complexNumberMultiply(string a, string b) { int aplus = a. find('+'); int bplus = b. find('+'); int ai = a. find('i'); int bi = b. find('i'); int a1 = stoi(a. substr(0, aplus)); int b1 = stoi(a. substr(aplus + 1, ai), nullptr); int a2 = stoi(a. substr(0, bplus), nullptr); int b2 = stoi(a. substr(bplus + 1, bi), nullptr); int aa = a1 * a2 - (b1 * b2); int ab = a1 * b2 + a2 * b1; string res = to_string(aa) + "+" + to_string(ab) + "i"; return res; }};

the correct answer is: a.)it is never appropriate to use acronyms and emoticons in business communication.

answer

true

explanation

stem(science, technology, engineering and math)   skills in every career. for example, to operate a business, you require stem skills to provide estimates to customers, prepare budgets and promote business online. the stem careers that are currently in high demand are application software developers, market research analysts, civil engineers, industrial engineers, electrical engineers, and family and general practitioners.

a.

explanation: