A1 Olympics review Day 3

Tara sells her paintings for $328 each. A 6% sales tax is added to the sale price.

Which equation can be used to calculate the total number of paintings sold, x, if the total sales amount, including tax, is $1390.72?

• 328=1390.72(1+0.06)x

• 1390.72=(328+0.06)x

• 1390.72=328(1+0.06)x

• 1390.72=328(1+6)x

Select the best approximations for the correlation coefficients of these scatter plots

• [A] .9 | [B] 0 | [C] -.9

• [A] .9 | [B] -.9 | [C] 0

• [A] 0 | [B] .9 | [C] -.9

• [A] -.9 | [B] .9 | [C] 0

• (3, 4, 2, 4, 3, 5, 2, 6, 2, 1, 6, 6)

• (3, 3, 3, 4, 3, 6, 2, 5, 5, 1, 6, 6)

• (1, 1, 2, 3, 3, 3, 4, 4, 5, 6, 6, 6)

• (4, 3, 5, 1, 4, 6, 2, 6, 3, 2, 6, 6)

• An increase in the number of falling tree limbs causes an increase in wind speed.

• An increase in the number of car accidents causes an increase in total rainfall.

• High wind speed cannot cause a car accident.

• High wind speed causes an increase in the number of fallen tree limbs.

• An increase in rainfall causes an increase in the number of car accidents.

• $v\left(t\right)=25,000\left(0.8\right)^t$

• $v\left(t\right)=25,000\left(1.2\right)^t$

• $v\left(t\right)=25,000-5,000t$

• $v\left(t\right)=25,000-25,000\left(0.2\right)^t$

Tameka is comparing two savings plans. With Plan 1, Tameka starts with $500 and adds $500 every two months. With Plan 2, Tameka starts with $500 and adds 50% more every two months. Which statements comparing the plans are true?

• Plan 1 shows linear growth and Plan 2 shows quadratic growth.

• Plan 1 shows linear growth and Plan 2 shows exponential growth.

• For the first six months, Plan 1 provides more money than Plan 2.

• Because the average rate of change for Plan 1 is constant, Plan 1 eventually

  provides more money than Plan 2.

• {25, 35, 45, 75, 95}

• {0, 0, 6, 4, 8, 0, 0, 7, 0, 10}

• {20, 20, 20, 25, 25, 25, 30, 30, 35, 35, 40, 40, 40, 40, 45, 45, 45, 45, 70, 70, 70, 70, 70, 70, 70, 90, 90, 90, 95, 95, 95, 95, 95, 95, 95}

• {25, 25, 25, 30, 30, 30, 35, 35, 40, 40, 45, 45, 45, 45, 50, 50, 50, 50, 75, 75, 75, 75, 75, 75, 75, 95, 95, 95, 100, 100, 100, 100, 100, 100, 100}

Select all expressions equivalent to 16(2)^n-3.

• (2)^4n-12

• (2)^4n-3

• (2)ⁿ⁺¹

• 8(2)^n-1

• 8(2)^n-2

Which expression is equivalent to 70+330(2.7)^-2h?

• $70+330\left(\frac{1}{7.29}\right)^{-h}$

• $70+330\left(\frac{1}{7.29}\right)^h$

• $70+330\left(7.29\right)^{-2h}$

• $70+330\left(7.29\right)^h$

Which equation best models the data?

• $w=\frac{1}{4}t+15$

• $w=\frac{1}{2}t+14$

• $w=t+13$

• $w=t+14$