Heidi subtract 9 from 17. first she adds to get 10.then she added again to find her answer is Heidi correct Heidi is not correct to add blank then you add blank more to get 10 to 17 the answer is

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?