Its A.
The formula is y-y1 = m (x-x1) so by looking at just the slope, (slope is m) , since slope is -7, -7 should be placed where M is
The radius of a circleis part of the circumference formula: C = 2 pi r.
So we rearrange the formula: r = c/2 pi.
Now we have to figure out the circumference. If the outside of the circle is 12 cm for 17degrees, then17 degrees x what is 360 degrees? 360 divided by 17 is 21.2. So the 12 cm should be multiplied by 21.2, to give 254.1cm. This is our circumference.
Now we do r = 254/2 pi.
r = 40.46cm.
This exercise wants you to build a linear system of two equations and two unknowns.
To do so, we assign a variable to each of the quantity we want to calculate, so let's call the cost of one daylily and the cost of one shrub.
We know that Ashley bought 7 daylilies and 2 shrubs, so she paid
Similarly, Lisa spent
for 14 daylilies and 11 shrubs.
So, the system is
To solve the system, we must manipulate its equations in order to find the value of one particular variables. For example, we can multiply the first equation by 2 to get
Now, if you subtract the first equation from the second you have
So, one shrub costs 12 dollars. We can substitute this value for in any of the equation, and solve it for . For example, if we choose the first one we have
So, one daylily costs 3 dollars.