I'll pick a brainliest
a metalsmith is mixing two molten metals, each containing different percentages of silver. the table shows the amount of each molten metal used.

which two expressions are both equivalent to t, the total number of grams in the mixture?

a. (15)(0.75) and 0.7(15 – x) + 0.9x
b. (15)(0.75) and 0.7(15 – x)(0.9x)
c. 15 + 0.75 and 0.7(15 – x) + 0.9x
d. 15 + 0.75 and 0.7(15 – x)(0.9x)

Total no. of grams in mixture is (15)(0.75) and 0.75(15-x) + 0.9x.

Step-by-step explanation:

Given,

The mass of one metal in grams is 15-x with 70% silver gives 0.7(15-x) g.

The mass of other metal in grams is x with 90% silver gives (0.09)x g.

We have to find the mixture

Given mixture 15 grams with silver content 0.7, then

Total number of grams in mixture is (15)(0.75) ad it is also equivalent to the total sum of mass of above two which gives 0.75(15-x) + 0.9x.

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)