Will give brainliest.

Find the value of c that makes the expression a perfect square trinomial.

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?