3. A restaurant opened at the beginning of May 2019 and served 1,600 customers in the first month that it was open. After some online advertising, they served \( 50 \% \) more customers in June. Then the restaurant received a few bad reviews on Yelp, and the number of customers decreased by \( 25 \% \) in July. How many customers did the restaurant serve in July?

10/10/2024-Continuidad pedagógica - actividad obligatoria. Act. 1 Resolver los siguientes cálculos combinados. Tiene que estar la separación en términos. Y el paso a paso con TODAS las cuentas. \( \begin{array}{ll}\text { a) } 15:(-7+2)= & \text { d) }-38:(-19)-[-6 \cdot(-9+4)]= \\ \text { b) }(8-13) \cdot(-4-3)= & \text { e) }-[-9-(-22+16)]+42:(-3-4)= \\ \text { c) } 48-[34-(11+27)-15]-8= & \text { f) }(-75+42):(-16+5)-15=\end{array} \)

23. Ar 1750 var världens befolkning 750 miljoner. Ar 1870 var världens befolkning dubbelt så stor. Med hur många procent ökade befolkningen i genomsnitt per âr?

2. År 2014 var elpriset 27 öre per kWh. Det var \( 40 \% \) lägre än âret innan. Hur mycket kostade 1 kWh år 2013? \( 1 \mathrm{kWh}=1 \) kilowattimme

2. (6 points) Let \( \mathrm{a}=-5,3+7,5-12,2 \) \( \mathrm{~b}=7,1+(-3,6)-(2,1-6,6) \) \( \mathrm{c}=(3 \times 2 \div 2-9)+[7 \times(-2)+3] \) \( \begin{array}{l}\text { a) } \quad \text { Calculate } \mathrm{a}, \mathrm{b} \text { and } \mathrm{c} . \\ \text { b) } \quad \text { Range } \mathrm{a}, \mathrm{b} \text { et } \mathrm{c} \text { in decreasing order. } \\ \text { c) } \quad \text { Find : } \mathrm{a}+\mathrm{b}+2 \\ \mathrm{c}-\mathrm{a}-22.4 \\ \mathrm{a} \times 3.4+\mathrm{b} \times 5.5-\mathrm{c} \\ \\ (\mathrm{a} \div 2-9.7)+(\mathrm{c}-\mathrm{b}+5.7)\end{array} \)

Find the greatest common divisor (also called greatest common factor) and least common multiple of 28 and 70 . \( \operatorname{gcd}(28,70)= \) \( \operatorname{lcm}(28,70)=140 \)