2019年8月26日 · 21 multiplied by** 1/3 **will equal 7. 21 multiplied by a missing figure will give you 7. Form an expression assuming that the missing figure that would take 21 to 7** is m. ** The relevant expression will be: 21 x m = 7. 21m = 7. You can then solve for m: 21m = 7. m = 7/21. m = 1/3. If 21 is multiplied by 1/3, it **will give 7.

2020年10月5日 · To find what times 21 equals 7, we can set up the equation as follows: 21 x = 7. To solve for x, we need to isolate it. We do this by dividing both sides of the equation by 21: x = 21 7 Simplifying 21 7 gives us: x = 3 1 So, 3 1 times 21 equals 7. This is indeed possible to multiply something by 21 to get 7, specifically 3 1 .

2025年1月25日 · 7 x 2 1 x = (7 21 ) x. Next, we simplify the fraction 7 21 , which equals 3: (7 21 ) x = 3 x. Now we need to determine which of the given expressions are equivalent to 3 x: A. (7 21 ) x: This is equivalent to 3 x as shown above. Equivalent. B. 3: This expression does not have the variable x, so it is not equivalent to 3 x unless x = 1. Not ...

2022年8月29日 · 21x/21 = 7/21 . x = 7/21 . x = 1/3. Hence the value of x is 1/3 . Learn more on expression here: ...

Taking the original expression 21^x/7x, it's clear that 21 can be rewritten as 7p, so 21^x/7x simplifies to (7 ∗ 3) x /7 x = 7 x ∗ 3 x /7 x = 3 x (because 7 x / 7 x = 1). From the given options, Option C: 3^x, and **Option E: ** 7 x ∗ 3 x / 7 x satisfy this criterion, as they also simplify to 3^x. Option F: (21/7)^x also simplifies as ...

2020年9月14日 · To solve the equation 21 × x = 7, we need to isolate the variable x. Here are the steps: Start with the original equation: 21 x = 7. To isolate x, divide both sides of the equation by 21: x = 21 7 Now simplify 21 7 : 21 7 = 3 1 Thus, the solution is: x = 3 1

2023年11月12日 · To solve the equation x 2 + 10 x = − 21, we rewrite it as x 2 + 10 x + 21 = 0 and factor it to get the solutions x = − 7 and x = − 3. The correct answer is option C. The correct answer is option C.

2023年5月31日 · We set up our proportion: T U PQ = U V QR Substituting the known values: x 7 = 21 14 This simplifies to: x 7 = 3 2 Now, we can cross-multiply: 7 ⋅ 3 = 2 ⋅ x 21 = 2 x Dividing both sides by 2 gives: x = 2 21 Therefore, x = 10.5.

Calculating 3 21 : This gives us: (3 21 ) = 7 So, 3 x 2 1 x = 7 x. Now, let's evaluate the options: A. (21 − 3) x: This is incorrect because b x a x = (a − b) x. B. 7: This is incorrect because it doesn’t account for the exponent x. C. 7 x: This is correct as shown above. D. (21/3) x: This is also correct since it simplifies to 7 x. E. 7 ...

2017年3月29日 · Similarly, setting x = 7 gives: 7 2 − 10 (7) = 49 − 70 = − 21, confirming that both solutions are valid. This solution uses the factoring method, which is a standard technique for solving quadratic equations.