Cinthya and Mirta went shopping. Cinthya bought 2 CDs and 3 DVDs for at total of $90. Mirta bought 3 CDs and 1 DVD for a total of $65. Write a system of equations that could be used to determine the cost of 1 CD, c, and 1 DVD, d.

How do i do this? i don’t understand

which of the following sets of data would produce the largest value for an independent-measures t statistic? the two sample means are 10 and 20 with variances of 20 and 25 the two sample means are 10 and 20 with variances of 120 and 125 the two sample means are 10 and 12 with sample variances of 20 and 25 the two sample means are 10 and 12 with variances of 120 and 125

Asporting good store is offering 30 percent off of the original price(x) of football cleats. the discount will be reduced by an another $7 before sales tax.