Helene is finding the sum (9 + 10i) + (-8 + 11i). She rewrites the sum as (-8 + 11) i + (9 + 10) i. Which statement explains the property of addition that she made an error in using?

X^2+13x-30 find the vertex

John ate too many holiday cookies and gained 2.3 kg in December then he went on a diet and lost 1.5 kg in January then he lost another 3.7 kg in February John wants to know what the total change in his weight was over these three months

Expanded form for 1.7

I have to show my work. Wyatt hiked 6 miles in 2 hours. At this same rate, what is the total number of miles Wyatt could hike in 9 hours? a) 3, b) 7, c) 21, d) 21

Jason multiplies 13.8 and 23.6 and gets 32.568. By just looking at Jason's answer, how do you know that it is incorrect? What is the correct answer?

What is 6.825 as a mixed number in simplest form

Mark wants to paint a mural he has one and 1/3 gallons of yellow paint 1 1/4 gallon of green paint and 7/8 gallons of blue paint mart plans plans to use 3/4 gallons of each paint color how many gallons of paint will he have left after painting the

Which conic section is represented by the polar equation r=3 / (4+2sintheta) ? A. ellipse B. hyperbola C. parabola D. circle

1/2ab• (-a^2b) simplified

Place the following steps in order to complete the square and solve for the quadratic equation, x squared - 6x + 7=0