Noah bought 15 baseball cards for $9.00. Assuming that each baseball card costs the same amount, answer the following questions. How much will 30 baseball cards cost?

Use addition and subtraction to simplify the following polynomials. a. add polynomials: (3 – 4x + 8x^2) + (–6 + 2x – 5x^2) step 1: rewrite the polynomials without the parentheses. step 2: write the polynomial in descending order and use parentheses around like terms. step 3: add the like terms identified in step 2 to simplify the polynomial. b. subtract polynomials: (3x – 5 – 7x^2) – (–2 + 6x^2 – 5x) step 1: rewrite the polynomials without the parentheses. remember to multiply each term in the second parentheses by –1. show your work. step 2: write the polynomial in descending order and use parentheses around like terms. step 3: add the like terms identified in step 2 to simplify the polynomial.

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i