Write an expression for the calculation double the product of 4 and 7

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

What value of x will make the triangles similar by the sss similarity theorem?

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.