Can someone me with a few of these questions

15x, 35x+75y, , 5+c

Step-by-step explanation:

When we have unknown amounts, we use a variable to write a term.

Books cost $6.25 each plus a shipping & handling fee of $8.75 for a total of $15. We use a variable like x to represent how many books we order at $15. So 15x.

We do the same for chairs and sofas. Each chair costs $35 so we write 35x. Each sofa costs $75 so we write 75y. We add together for 35x+75y

We write expressions based on situations or just descriptions. n divided by 7 is and 5 more than c is 5+c.

the fist one is not equalvalent but i think th second one isand the third isnt definetly or the last one is i think. hope this !

step-by-step explanation:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it