19+7÷2 x 6+1=1 we’re to put brackets to make it =1

In need of in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab