consider order of operations expression 9+3x2^2-1x4,show where to place grouping symbols so the value of the expression is 45

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Let hh represent the number of hummingbirds and ss represent the number of sunbirds that must pollinate the colony so it can survive until next year. 6h+4s > 746h+4s> 74 this year, 88 hummingbirds pollinated the colony. what is the least number of sunbirds that must pollinate the colony to ensure that it will survive until next year?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)