40 Question Mock NEW STAAR (MATH8)

Scale factor ( $$k=\frac{i'}{p}$$ ) for perimeter is the SAME as for a side.

k_perimeter = k_side

Scale factor for area is the side scale factor SQUARED( $$k^2$$ ).

k_area = k_side²

Use inverse operations.

Move the smaller coefficient first $$0.03x$$ by subtracting from both sides.

Then move the $$-0.03$$ from the left side by adding to both sides.

Last remove the coefficient by dividing by it on both sides.

Draw a straight line on Patty Paper and place it over the graph so that it is in the middle of the points - equal points above the trend line as below the trend line.

Extend out the x-axis to 45 go up to the trend line, stop, and go over to the y-axis for answer.

Equation needs to be in slope-intercept form.

"m" is the slope/rate - look for key words like each, every, per, or percent.

"b" is the y-intercept/starting amount - look for words like fee, shipping, or extra.

Label a, b, and c. Side "c" is the longest/biggest side.

Substitute into Pythagorean Theorem $$a^2+b^2=c^2$$ and enter into calculator to see if true or false. This questions is asking for NOT - so pick false.

Notice the labels on the x-axis and y-axis.

Find the graph that has a point at x = 2 hours and y = 0.8 gallons.

Notice - diameter is given so divide it by 2 to find the radius $$r=\frac{3.5}{2}$$

NEVER ROUND!!!

Find formula for volume of a cylinder $$V=Bh=\left(\pi r^2\right)h$$ Substitute in the variables given $$V=122.5\pi$$ and $$r=1.75$$

Notice that the π is multiplied on both sides - so it cancels out.

Use the vertical line test to see if x-value repeats. If it crosses a vertical line more than 1 time, then NOT a function.

Draw the TRIANGLE base and label the sides.

Find P( $$b+h+side$$ ) and B( $$\frac{1}{2}bh$$ ) of the triangle.

Only number not used to find P and B is the h of the prism.

Solve for Total Surface Area

$$S=Ph+2B$$

Subtract all the money that is given to help the student pay for college.

Then divide by the total number of months available to save.